JP3753128B2 - Plasma display panel - Google Patents

Description

【００５８】
この表１から明らかなように、真空空間で作製したＮｏ．１のパネルと乾燥Ｎ₂雰囲気で作製したＮｏ．２のパネルにおいては、蛍光体へのＨ₂Ｏ，ＣＯ₂の吸着量が非常に少なく、初期の電圧マージンが非常に大きく、またマージンの変化もほとんどなく、長期にわたり安定な放電が実現できる。これに対し、ＣＯ₂の不純物ガス吸着を行ったＮｏ．３、Ｎｏ．４のパネルにおいては、Ｎｏ．１、Ｎｏ．２のパネルに比べて、放電ミスの回数が減少した。これによりＣＯ₂を吸着させることにより、放電ミスを低減できることが分かる。しかしながら、一方ではＣＯ₂の１％雰囲気で作製したＮｏ．４のパネルでは、初期の電圧マージンが小さく、また輝度の低下も同時にみられることがわかった。また、ＣＯ₂の吸着量の５００度までのピーク分子数が１×１０¹⁵個／ｇを境にこの輝度劣化が大きく発生することが本発明者らにより確認されている。
【００５９】
従って、蛍光体へのＣＯ₂の吸着量を５００度までのピーク分子数で１×１０¹³個／ｇ〜１×１０¹⁵個／ｇの範囲で行うことにより、大きな輝度劣化を招くことなく放電ミスの回数を低減することができる。
【００６０】
また、Ｎ₂雰囲気にＣＯ₂を０．１％添加し、Ｈ₂Ｏを分圧で３Ｔｏｒｒと３０Ｔｏｒｒ添加して作製したＮｏ．５とＮｏ．６のパネルにおいて、ＣＯ₂を０．１％のみ添加したＮｏ．３のパネルと比べると、電圧マージンの大きな低下もなく、点灯電圧の低減と輝度向上の効果が得られる。しかしながら、Ｈ₂Ｏを３０Ｔｏｒｒ添加したＮｏ．６のパネルにおいては、マージンの変化量が大きく、長期間の安定放電は困難である。マージンの変化量は、蛍光体に吸着させたピーク分子数が５×１０¹⁵個／ｇ以上になると、大きくなり電圧マージンが減少することが本発明者らにより確認されている。
【００６１】
従って、蛍光体へのＨ₂Ｏの吸着量を３００度以上でのピーク分子数で１×１０¹⁵個／ｇ〜５×１０¹⁶個／ｇとすることにより、パネル点灯による電圧マージンの大きな低下を招くことなく、放電電圧を低減することができる。これにより、高輝度で長期にわたり安定放電が可能で、放電電圧を下げることができる。
【００６２】
また本実施の形態において、ＣＯ₂とＨ₂Ｏをともに吸着させることにより、それぞれの吸着ガスの効果を有するとともに、さらにＣＯ₂，Ｈ₂Ｏの各々単独の不純物ガス吸着では見られなかった輝度向上が確認できた。これはＣＯ₂による輝度劣化要因がＨ₂Ｏにより抑えられていることを意味しており、輝度劣化を生じる蛍光体へのＣＯ₂の吸着サイトに、Ｈ₂Ｏが吸着するために輝度劣化が低減することが考えられる。また、同時に放電電圧の低減により、Ｘｅの紫外線放射効率も上昇していることが考えられる。また、このＨ₂ＯによるＣＯ₂の輝度低減抑制効果ならびに輝度向上の相乗効果は、ＣＯ₂とＨ₂Ｏとのピーク分子数の比に大きく関係していることが本発明者らにより確認されており、Ｈ₂Ｏのピーク分子数がＣＯ₂のピーク分子数に対する比率として、３．７から４．３であることが好ましく、４．０付近が最も効果的であることがわかった。
【００６３】
ここで、吸着分子数Ｘ（個／ｇ）とは、昇温脱離質量分析において排気速度をＳ（ｍ³／ｓ）、測定間隔時間をｔ（ｓ）、全検出イオン電流をＩ（Ａ）、求めたい分子のイオン電流をＪ（Ａ）、電流検出時の圧力をＰ（Ｐａ）測定試料の重さをＷ（ｇ）とした時、気体定数をＲ、温度をＴ、アボガドロ数をＮとして、
Ｘ＝｛Ｎ／（Ｒ×Ｔ）｝×Ｐ×Ｓ×ｔ×（Ｊ／Ｉ）／Ｗ＝２．４７１×１０²⁰×Ｐ×Ｓ×ｔ×（Ｊ／Ｉ）／Ｗの式より求まる値であり、本実施の形態では排気速度０．１９（ｍ³／ｓ）、測定間隔時間１５（ｓ）により測定したデータを用いている。
【００６４】
以上のように本発明によれば、不活性ガス以外の不純物ガスをパネル面内に均一に制御よく導入することが可能であり、また不純物ガスとしてＨ₂ＯとＣＯ₂を導入することにより、その不純物ガスの効果により、ＰＤＰにおける放電電圧の低電圧化、安定放電、高輝度化、高効率化、長寿命化などの特性向上を実現することができる。
【００６５】
（実施の形態２）
次に、本発明の実施の形態２について説明する。
【００６６】
本実施の形態２においては、封着工程時、または封着工程前に少なくともＣＨ₄を含む不純物ガスを蛍光体層に吸着させるもので、上記実施の形態１と同様に、吸着させる不純物ガスを限定するため、図２の点線で囲むように、前面側のガラス基板は保護膜である酸化マグネシウムを真空電子ビーム蒸着法により形成した後、背面側のガラス基板は蛍光体焼成後より、不純物ガス吸着工程１７を除くすべての工程において１０^-4Ｐａ以下の真空、または露点−６０度以下の乾燥Ｎ₂雰囲気で、ガス封入工程１５まで行った。なお、背面側のガラス基板の蛍光体焼成工程までは大気中で行うため、不純物ガス吸着工程１７の前に、真空加熱を６００℃で行い、大気中での吸着ガスの脱ガス処理１８を行った。また、不純物ガス吸着工程１７は、この脱ガス処理１８の降温時に、Ｈ₂Ｏ、ＣＨ₄を含む所望の不純物ガスを導入し、室温に下がるまでこのガス雰囲気に曝すことにより行う。
【００６７】
このような本実施の形態２は、不純物ガスとしてのＣＨ₂の昇温脱離質量分析（ＴＤＳ）における０から６００度までに見られるピーク分子数、およびＨ₂Ｏの３００度以上に見られるピーク分子数との間に相関があることを見出したことに基づくものであり、以下に説明するように、上記実施の形態１と同様な効果が得られる。
【００６８】
なお、昇温脱離分析において、上記不純物以外にもＣＨ系不純物が重合した、より質量数が大きいＣ_nＨ_2n+2で表されるメタン系炭化水素やＣ_nＨ_2nで表されるエチレン系炭化水素などの不純物も検出されるが、ＣＨ₂の吸着量が放電特性と大きな相関があった。これは低級の分子が最も放電に影響しやすいためであると思われる。また、昇温脱離分析法においてＣＨ₄の吸着量評価に対し、Ｏが同質量数で妨害イオンとなるため、ＣＨ₄の吸着量の測定が困難であるため、ＣＨ₂の吸着量をＣＨ₄の吸着量の指標として用いた。
【００６９】
次に、不純物ガス吸着工程におけるガス雰囲気とパネル完成後の不純物ガスの青色蛍光体への吸着量とについて、実験を行った結果について説明する。表２にその結果を示している。なお、表２における各項目の意味は、上記表１と同様な意味であり、説明は省略する。
【００７０】
【表２】

【００７１】
この表２から明らかなように、真空空間で作製したＮＯ．１のパネルと乾燥Ｎ₂雰囲気で作製したＮＯ．２のパネルにおいては、蛍光体へのＨ₂Ｏ、ＣＨ₄の吸着量が非常に少なく、初期の電圧マージンが非常に大きく、またマージンの変化もほとんどなく、長期にわたり安定な放電が実現できる。これに対し、ＣＨ₄の不純物ガス吸着を行ったＮＯ．３、ＮＯ．４のパネルにおいては、ＮＯ．１、ＮＯ．２のパネルに比べて、放電ミスの回数が減少した。しかしながら、一方ではＣＨ₄の１％雰囲気で作製したＮＯ．４のパネルでは、電圧マージンの減少と輝度の低下も同時に見られる。また、ＣＨ₂の吸着量の１００度〜６００度までのピーク分子数が２×１０¹⁵個／ｇを境にこの輝度劣化が大きく発生することが本発明者らにより確認されている。
【００７２】
従って、蛍光体へのＣＨ₂の吸着量を１００度〜６００度までのピーク分子数で０．５×１０¹⁴個／ｇ〜３．０×１０¹⁴個／ｇの範囲で行うことにより、大きな輝度劣化を招くことなく放電ミスの回数を低減することができる。
【００７３】
また、Ｎ₂雰囲気にＣＨ₄を０．１％添加し、Ｈ₂Ｏを分圧で３Ｔｏｒｒと３０Ｔｏｒｒ添加して作製したＮＯ．５とＮＯ．６のパネルにおいて、ＣＨ₄を０．１％のみ添加したＮＯ．３のパネルと比べると、電圧マージンの大きな低下もなく、点灯電圧の低減と輝度向上の効果が得られる。しかしながら、Ｈ₂Ｏを３０Ｔｏｒｒ添加したＮＯ．６のパネルについては、点灯に伴いマージンの低下が大きく、長期間の安定放電は困難である。
【００７４】
点灯による電圧マージンの低下は蛍光体へ吸着させたＨ₂Ｏの３００度以上で現れるピーク分子数が５×１０¹⁵個／ｇ以上になると大きくなり、電圧マージンが減少することが本発明者らにより確認されている。従って、蛍光体へのＨ₂Ｏの吸着量を３００度以上でのピーク分子数で１×１０¹⁵個／ｇ〜５×１０¹⁶個／ｇとすることにより、パネル点灯による電圧マージンの大きな低下を招くことなく放電電圧を低減することができる。これにより、高輝度で長期にわたり安定放電が可能であって、放電電圧を下げることができる。
【００７５】
また本実施の形態において、ＣＨ₄とＨ₂Ｏをともに吸着させることにより、それぞれの吸着ガスの効果を有するとともに、さらにＣＨ₄、Ｈ₂Ｏの各々単独の不純物ガス吸着では見られなかった輝度向上が確認できた。これはＣＨ₄による輝度劣化要因がＨ₂Ｏにより抑えられていることを意味しており、輝度劣化を生じる蛍光体へのＣＨ₄の吸着サイトにＨ₂Ｏが吸着することにより輝度劣化が低減するものと考えられる。また、同時に放電電圧の低減により、Ｘｅの紫外線放射効率も上昇していることが考えられる。ただし、Ｈ₂ＯによるＣＨ₄の輝度低減抑制効果ならびに輝度向上の相乗効果は、ＣＨ₄の吸着量の指標となるＣＨ₂の１００度〜６００度の間で現れるピーク分子数と、３００度以上で現れるＨ₂Ｏのピーク分子数の比に大きく関係していることが本発明者らにより確認されており、図４に示すようにＨ₂Ｏの３００度以上で現れるピーク分子数がＣＨ₂の１００度から６００度の間で現れるピーク分子数に対する比率として、０．０５以下で特に効果があり、逆に０．０５以上では輝度が低下していく。
【００７６】
また、３００度以上で現れるＨ₂Ｏのピーク分子数が５×１０¹⁵個／ｇ以上では、前記吸着量の比率が０．０５以上における輝度低下の傾きが穏やかであったが、３００度以上で現れるＨ₂Ｏのピーク分子数が５×１０¹⁵個／ｇ以下の時には、前記比率の増加に伴う輝度低下の傾斜が強くなる傾向が見られる。
【００７７】
以上のことより、電圧マージンの低下を招くことなく輝度を向上させるには、３００度以上で現れるＨ₂Ｏのピーク分子数が５×１０¹⁵個／ｇ以下で前記吸着量の比率が０．０５以下となることが最も望ましい。
【００７８】
なお、図４は、Ｈ₂Ｏの吸着量について昇温脱離分析法より分析した結果において、３００度以上の領域で現れる脱離Ｈ₂Ｏのピーク分子数に対する１００度から６００度までの領域で現れる脱離ＣＨ₂のピーク分子数の比率と輝度の関係を示す図である。
【００７９】
以上のように本発明によれば、不純物ガスとしてＨ₂ＯとＣＨ₄を導入することにより、その不純物ガスの効果により、ＰＤＰにおける放電電圧の低電圧化、安定放電、高輝度化、高効率化、長寿命化などの特性向上を実現することができる。
【００８０】
また、以上の説明では、青色蛍光体としてＢａＭｇＡｌ₁₀Ｏ₁₇：Ｅｕを用いた場合を例にして説明したが、特開２０００−２２６５７４号公報において公開されている（Ｂａ_1-mＳｒ_m）ｉＭｇＡｌ_jＯ_n：Ｅｕ_kで表され、０≦ｍ≦０．２５、１．０≦ｉ≦１．８、１２．７≦ｊ≦２１．０、０．０１≦ｋ≦０．２０、２１．０≦ｎ≦３４．５からなる組成のアルミン酸塩を用いると、Ｈ₂Ｏの吸着特性が赤、緑色蛍光体の特性に近づくため、不純物ガスの吸着の制御性がさらに容易になるという効果が得られる。
【００８１】
【発明の効果】
以上のように本発明によれば、不活性ガス以外の不純物ガスをパネル面内に均一に制御よく導入することが可能であり、その不純物ガスの効果により、ＰＤＰにおける放電電圧の低電圧化、安定放電、高輝度化、高効率化、長寿命化などの特性向上を実現することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態におけるプラズマディスプレイパネルの概略構成を示す斜視図
【図２】同じくプラズマディスプレイパネルの製造方法における製造工程図
【図３】不純物ガス吸着工程におけるＨ₂Ｏ分圧に対する各蛍光体の吸着量を示す特性図
【図４】Ｈ₂Ｏのピーク分子数に対するＣＨ₂のピーク分子数の比率と輝度の関係を示す特性図
【符号の説明】
１、５ 基板
２ 表示電極
３ 誘電体層
４ 保護膜
７ アドレス電極
９ 蛍光体層[0001]
BACKGROUND OF THE INVENTION
  The present invention utilizes gas discharge luminescence used for color television receivers and displays for displaying characters or images.Plasma display panel (PDP)It is about.
[0002]
[Prior art]
In this PDP, an ultraviolet ray is generated by gas discharge, and a phosphor is excited by the ultraviolet ray to emit light to perform color display. And the display cell divided by the partition is provided on the board | substrate, and it has the structure by which the light-emitting body layer is formed in this.
[0003]
This PDP is broadly divided into AC type and DC type in terms of driving, and there are two types of discharge types, a surface discharge type and a counter discharge type. From the viewpoint of high definition, large screen, and ease of manufacturing. At present, the mainstream of the PDP is a surface discharge type having a three-electrode structure, and the structure has a pair of display electrodes adjacent in parallel on one substrate and intersects with the display electrode on the other substrate. The address electrode arranged in the direction to be aligned, the barrier ribs, and the phosphor layer have a relatively thick phosphor layer, which is suitable for color display using the phosphor.
[0004]
Such a PDP is capable of high-speed display compared to a liquid crystal panel, has a wide viewing angle, is easy to increase in size, and is self-luminous, so that the display quality is high. Recently, it has attracted particular attention among panel displays, and is used for various purposes as a display device at a place where many people gather or a display device for enjoying a large screen image at home.
[0005]
Such a PDP is generally manufactured as follows. First, an address electrode made of silver is formed on a back glass substrate, and a visible light reflecting layer made of dielectric glass and a glass partition are formed on the glass substrate at a predetermined pitch. After applying each color phosphor paste including red phosphor, green phosphor and blue phosphor in each space between these partitions, the phosphor is baked to remove the resin component etc. in the paste A phosphor layer is formed to form a back plate. Thereafter, a low-melting glass paste is applied around the back plate as a sealing member with the front plate, and calcined at about 350 ° C. in order to remove resin components and the like in the low-melting glass paste.
[0006]
After that, the front plate on which the display electrode, the dielectric glass layer and the protective layer are sequentially formed and the back plate are arranged to face each other so that the display electrode and the address electrode are orthogonal to each other through the partition, and fired at about 450 ° C., The peripheral portion is sealed with a low melting point glass as a sealing member. Thereafter, the panel is evacuated while being heated to about 350 ° C., and after completion, a discharge gas is introduced by a predetermined pressure to obtain a finished product.
[0007]
In a conventional PDP, a rare gas containing at least xenon (Xe) is used as a discharge gas. The most commonly used is a discharge gas in which neon (Ne) is mixed with several percent of xenon (Xe), and the purity of the gas is a high-purity gas of about 99.99 to 99.999%.
[0008]
However, for the purpose of improving the discharge characteristics, it has been very difficult to add impurities other than the rare gas uniformly to the discharge gas at a predetermined concentration with good control. This is due to constituents in the PDP, and magnesium oxide (MgO) and phosphor materials as protective films in contact with the discharge gas are very adsorbable to gases other than inert gases. In addition, it is difficult to diffuse the impurity gas in the discharge gas in a controlled manner, and a large amount of impurity gas is adsorbed near the discharge gas introduction portion simply by mixing and introducing the impurity gas into the discharge gas. Brightness unevenness or discharge characteristic variation.
[0009]
Of these, BaMgAl, which is generally used as a blue phosphor._TenO₁₇: Eu is especially H₂There exists a subject that the adsorptivity with respect to O is high and heat deterioration is easy (refer patent document 1).
[0010]
In addition, in the PDP, the discharge voltage is as high as about 200 V, and it is necessary to reduce the voltage in terms of circuit cost and panel withstand voltage, and at the same time, stable discharge, high brightness, high efficiency, and long life are required. ing.
[0011]
[Patent Document 1]
JP 2001-35372 A
[0012]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and an object of the present invention is to realize improvement in characteristics such as lower discharge voltage, stable discharge, higher brightness, higher efficiency, and longer life. Is.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method for adhering an impurity gas other than an inert gas to a phosphor layer during a sealing process for sealing a peripheral portion of a substrate or before a sealing process, and for lighting a panel. The impurity gas is released into the discharge gas, and it becomes possible to add impurities to the discharge gas with good control, and it has lower voltage, higher brightness, higher efficiency, longer life, etc. than the conventional one. Improved characteristics can be realized.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
  That is, according to the first aspect of the present invention, a pair of substrates are arranged to face each other so that a space is formed between them, and a peripheral portion is sealed by a sealing member, and discharge is generated in the space. In the plasma display panel in which electrodes are arranged on the substrate and a phosphor layer that emits light by discharge is provided, the phosphor layer has a blue phosphor, and CO is applied to the blue phosphor.₂The amount of adsorbed is desorbed CO that appears in the region from 0 to 500 degrees in the temperature programmed desorption analysis.₂The number of peak molecules is 1 × 10¹⁵Pieces / g or less(Excluding 0)It is characterized by being.
[0015]
  Also,According to a fourth aspect of the present invention, a pair of substrates are arranged so as to face each other so that a space is formed, and a peripheral portion is sealed with a sealing member, and an electrode is formed on the substrate so that discharge occurs in the space. And a phosphor layer that emits light by discharge is provided with a blue phosphor as the phosphor layer, and H is applied to the blue phosphor. ₂ The adsorption amount of O is the desorption H that appears in the region of 300 ° C. or more in the temperature programmed desorption analysis. ₂ Desorbed CO appearing in the region where the peak molecular number of O is from 0 to 500 degrees ₂ It is 3.7 times or more and 4.3 times or less of the number of peak molecules of.
[0016]
  The invention according to claim 6 is a substrate in which a pair of substrates are opposed to each other so that a space is formed therebetween, a peripheral portion is sealed by a sealing member, and discharge is generated in the space. In the plasma display panel in which electrodes are arranged and a phosphor layer that emits light by discharge is provided, the phosphor layer has a blue phosphor, and CH to the blue phosphor_FourThe amount of adsorption of desorbed CH that appears in the region from 100 degrees to 600 degrees in the temperature programmed desorption analysis₂Has a peak molecular number of 3.0 × 10¹⁴Pieces / g or less(Excluding 0)It is characterized by being.
[0017]
  Furthermore, the invention according to claim 9 is a substrate in which a pair of substrates are arranged to face each other so that a space is formed between them, and a peripheral part is sealed with a sealing member, and discharge is generated in the space. In the plasma display panel in which the electrodes are arranged and the phosphor layer that emits light by discharge is provided, the phosphor layer has a blue phosphor, and H is applied to the blue phosphor.₂The adsorption amount of O is the desorption H that appears in the region of 300 ° C. or more in the temperature programmed desorption analysis.₂Desorption CH appearing in the region of 100 to 600 degrees with respect to the peak molecular number of O₂The ratio of the number of peak molecules is 0.05 or less(Excluding 0)It is characterized by being.
[0018]
  The invention according to claim 10 is a substrate in which a pair of substrates are arranged opposite to each other so that a space is formed, a peripheral portion is sealed with a sealing member, and discharge is generated in the space. In the plasma display panel in which the electrodes are arranged and the phosphor layer that emits light by discharge is provided, the phosphor layer has a blue phosphor, and H is applied to the blue phosphor.₂The adsorption amount of O is the desorption H that appears in the region of 300 ° C. or more in the temperature programmed desorption analysis.₂The peak molecular number of O is 1 × 10¹⁵Pieces / g or more 5 × 10¹⁵H per unit / g and blue phosphor₂The adsorption amount of O is the desorption H that appears in the region of 300 ° C. or more in the temperature programmed desorption analysis.₂Desorption CH appearing in the region of 100 to 600 degrees with respect to the peak molecular number of O₂The ratio of the number of peak molecules is 0.05 or less(Excluding 0)It is characterized by being.
[0025]
Hereinafter, a PDP according to an embodiment of the present invention and a manufacturing method thereof will be described based on specific examples.
[0026]
(Embodiment 1)
First, the first embodiment of the present invention will be described. FIG. 1 shows the structure of a PDP according to the present invention. As shown in FIG. 1, a striped display in which a scan electrode and a sustain electrode make a pair on a transparent front substrate 1 such as a glass substrate. A plurality of electrodes 2 are formed, and a dielectric layer 3 made of glass is formed so as to cover the electrode group, and a protective film 4 made of MgO is formed on the dielectric layer 3.
[0027]
Further, a visible light reflecting layer made of dielectric glass is provided on a substrate 5 such as a rear glass substrate disposed opposite to the front substrate 1 so as to intersect the display electrodes 2 of the scan electrode and the sustain electrode. A plurality of stripe address electrodes 7 covered with 6 are formed. On the visible light reflecting layer 6 between the address electrodes 7, a plurality of partition walls 8 are arranged in parallel with the address electrodes 7, and a phosphor layer 9 is provided on the side surface between the partition walls 8 and the surface of the visible light reflecting layer 6. It has been.
[0028]
The substrate 1 and the substrate 5 are opposed to each other with a minute discharge space so that the display electrodes 2 of the scan electrodes and the sustain electrodes and the address electrodes 7 are substantially orthogonal to each other, and the peripheral portion is a sealing member. In the discharge space, one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas. The discharge space is divided into a plurality of sections by partition walls 8 to provide a plurality of discharge cells in which the intersections of the display electrodes 2 and the address electrodes 7 are located, and each of the discharge cells has red, green, blue The phosphor layers 9 are sequentially arranged for each color.
[0029]
The red, green, and blue phosphor layers 9 are excited and emitted by vacuum ultraviolet rays (wavelength 147 nm) having a short wavelength generated by discharge, thereby performing color display.
[0030]
As the phosphor constituting the phosphor layer 9, the following materials are generally used.
[0031]
"Blue phosphor": BaMgAl_TenO₁₇: Eu
"Green phosphor": Zn₂SiO_Four: Mn or BaAl₁₂O₁₉: Mn
"Red phosphor": Y₂O_Three: Eu or (Y_xGd_1-x) BO_Three: Eu
Moreover, each color fluorescent substance can be produced as follows.
[0032]
Blue phosphor (BaMgAl_TenO₁₇: Eu) is the first barium carbonate (BaCO)_Three), Magnesium carbonate (MgCO_Three), Aluminum oxide (α-Al₂O_Three) Is mixed so that the atomic ratio of Ba, Mg, and Al is 1: 1: 1/10. Next, a predetermined amount of europium oxide (Eu) is added to the mixture.₂O_Three) And an appropriate amount of flux (AlF₂, BaCl₂) And a ball mill, and at 1400 ° C. to 1650 ° C. for a predetermined time, for example, 0.5 hours in a reducing atmosphere (H₂, N₂It is obtained by firing in the middle).
[0033]
Red phosphor (Y₂O_Three: Eu) Yttrium hydroxide Y as a raw material₂(OH)_ThreeAnd boric acid (H_ThreeBO_Three) In such a manner that the atomic ratio of Y and B is 1: 1. Next, a predetermined amount of europium oxide (Eu) is added to the mixture.₂O_Three), Mixed with a suitable amount of flux by a ball mill, and fired in air at 1200 ° C. to 1450 ° C. for a predetermined time, for example, 1 hour.
[0034]
Green phosphor (Zn₂SiO_Four: Mn) is zinc oxide (ZnO), silicon oxide (SiO₂) Is mixed so that the atomic ratio of Zn and Si is 2: 1. Next, a predetermined amount of manganese oxide (Mn₂O_Three) And mixing with a ball mill, followed by baking at 1200 ° C. to 1350 ° C. in air for a predetermined time, for example, 0.5 hours.
[0035]
A phosphor material having a predetermined particle size distribution can be obtained by pulverizing the phosphor particles produced by the above production method after pulverization.
[0036]
FIG. 2 shows a manufacturing process of the PDP according to the present embodiment. As shown in FIG. 2, on the back plate side, an address electrode made of silver is formed on a glass substrate, and a visible glass made of dielectric glass is formed thereon. Step 10 for producing the light reflecting layer and the glass partition walls at a predetermined pitch is performed.
[0037]
Next, each color phosphor paste containing red phosphor, green phosphor, and blue phosphor is applied in each space between the partition walls, and then the phosphor paste is baked at about 500 ° C. The phosphor component forming step 11 is performed to remove the resin component and the like and form a phosphor layer. In addition, after the phosphor is formed, a low melting glass paste is applied around the back plate as a sealing member with the front plate, and calcined at about 350 ° C. in order to remove the resin component and the like in the low melting glass paste. A low melting point glass paste forming step is performed.
[0038]
On the other hand, on the front plate side, an electrode for forming a display electrode and a dielectric layer on the glass substrate and a dielectric layer forming step 12 are performed, and then a protective film forming step 13 is performed.
[0039]
Thereafter, a front plate on which a display electrode, a dielectric glass layer, and a protective layer are sequentially formed, and the back plate are arranged opposite to each other so that the display electrode and the address electrode are orthogonal to each other through a partition wall, and fired at about 450 ° C. After performing the sealing step 14 for sealing the periphery with glass, the inside of the panel is evacuated while heating to about 350 ° C., and after completion, a gas sealing step 15 for introducing a discharge gas by a predetermined pressure is performed.
[0040]
A panel is completed by performing an aging process 16 in which an alternating voltage approximately twice that in normal operation is applied to the display electrodes formed on the glass substrate to generate a strong discharge so that a stable discharge can be performed.
[0041]
Here, in the present embodiment, the impurity gas is adsorbed to the phosphor layer at the time of the sealing process or before the sealing process. In order to limit the impurity gas to be adsorbed, it is surrounded by the dotted line in FIG. After the front side glass substrate is formed with magnesium oxide as a protective film by vacuum electron beam evaporation, the back side glass substrate is 10 in all steps except for the impurity gas adsorption step 17 after phosphor firing.^-FourVacuum less than Pa or dry N with dew point -60 degrees or less₂Up to the gas filling step 15 was performed in the atmosphere. Since the process up to the phosphor baking process of the glass substrate on the back side is performed in the atmosphere, vacuum heating is performed at 500 ° C. before the impurity gas adsorption process 17 and the degassing process 18 of the adsorbed gas is performed in the atmosphere. It was. Further, the impurity gas adsorption step 17 is performed when the temperature of the degassing process 18 is lowered.₂O, CO₂A desired impurity gas containing at least one of the above is introduced and exposed to this gas atmosphere until the temperature drops to room temperature.
[0042]
By the way, as described above, MgO and phosphor materials, particularly blue phosphors, present in the discharge space in the PDP have high adsorptivity of impurity gases other than inert gas, and the impurity gas causes in the panel surface. Luminance unevenness occurs and discharge characteristics vary. In order to solve such a problem, it is only necessary to prevent the impurity gas from being adsorbed, but this is actually difficult because of the configuration of the PDP.
[0043]
Therefore, the present inventors conducted various experiments and studies on whether or not the PDP characteristics could be improved and stabilized by controlling the amount of impurity gas adsorbed. As a result, the present invention has been found to actively provide an impurity gas adsorption step to control the amount of impurity gas adsorption.
[0044]
FIG. 3 shows the H for the PDP phosphor.₂It is a figure which shows the result of the experiment which the present inventors conducted about the adsorptivity of the impurity gas containing O, and, as shown in FIG.₂H in each color phosphor against O partial pressure₂It was found that there was a relationship with the amount of adsorption of O. That is, from the characteristics shown in FIG.₂A large amount of O is adsorbed, and at the same time H during the impurity gas adsorption process₂It was found that a large change rate was exhibited with respect to the partial pressure of O. Therefore, H in the internal space of the PDP₂The total amount of O is controlled by the blue phosphor H₂It was found that this is possible by controlling the amount of O adsorption.
[0045]
That is, an impurity gas adsorption step is provided before the sealing step, and an impurity gas other than the inert gas is adsorbed on the phosphor layer, thereby introducing the impurity gas other than the inert gas into the panel surface uniformly and with good control. Is possible. Further, as this impurity gas, according to experiments by the present inventors, H₂O and CO₂A gas containing at least one of the above may be introduced, and the effect of the impurity gas can realize a reduction in discharge voltage, stable discharge, high brightness, high efficiency, and long life.
[0046]
Here, the reason why the discharge characteristics can be controlled with good control by adsorbing the impurity gas to the phosphor will be explained. Generally, the driving method of the PDP is composed of initialization discharge, address discharge, and sustain discharge. As a principle of the above, the first initializing discharge has an effect of resetting the inside of the discharge cell by applying a large voltage, and only the address discharge is selectively performed based on the image signal to be displayed next. The discharge is sustained by a sustain discharge, and gradation expression is performed by the number of pulses of the sustain discharge. At this time, since discharge occurs between the display electrode formed on the front plate and the address electrode formed on the back plate during the initialization discharge and the address discharge, the phosphor formed on the address electrode on the back plate has impurities. If the gas is adsorbed, it is considered that the impurity gas is effectively released into the discharge gas by the initialization discharge and the address discharge. Since the phosphor material is highly adsorbable with respect to gases other than inert gas, the impurity gas once released into the discharge gas is considered to be re-adsorbed again after the end of the sustain discharge. It is considered that the discharge characteristics can be effectively controlled by adding the impurity gas to the discharge gas.
[0047]
In this embodiment, the impurity gas is adsorbed to the phosphor by exposing the back plate on which the phosphor is formed between the phosphor firing step and the sealing step to a gas containing a desired impurity gas. However, the sealing process is performed in a gas atmosphere containing a desired impurity gas, or a gas containing a desired impurity gas is allowed to flow through the internal space formed by the front plate and the back plate in the sealing process. Impurity gas can be adsorbed, and the same effect as in this embodiment can be obtained.
[0048]
By the way, according to experiments by the present inventors, the above-described effects of the present invention are as follows.₂Of peak molecules observed from 0 to 500 degrees in temperature programmed desorption mass spectrometry (TDS) of₂It was found that there is a correlation with the number of peak molecules observed at 300 ° C. or more.
[0049]
Next, the results of experiments conducted on the gas atmosphere in the impurity gas adsorption step and the amount of adsorption of the impurity gas on the blue phosphor after completion of the panel will be described. Table 1 shows the results. In addition, the meaning of each item in Table 1 is as follows.
[0050]
“Lighting voltage”: The sustain voltage required to light the entire panel.
[0051]
“Discharge error”: the number of discharge failures in 1000 address discharges. When the number of discharge failures increases, it causes image quality deterioration due to the occurrence of non-lighting.
[0052]
“Voltage margin”: A voltage difference from a lighting voltage necessary for lighting to a lighting failure occurrence voltage generated by increasing the sustain voltage. The larger this value, the more stable driving is possible.
[0053]
“Voltage margin after lighting”: Voltage margin after discharge for 500 hours by applying a 200 kHz sustain voltage.
[0054]
“Margin fluctuation”: The amount of change in the voltage margin before and after the discharge for 500 hours by applying the 200 kHz sustain voltage is indicated by voltage (V).
[0055]
“Relative luminance”: Panel No. The relative intensity with the value of 1 as 100 was expressed.
[0056]
In Table 1, actual numerical values are indicated, and evaluations of the numerical values are indicated by ◎, ○, Δ, and ×. ◎: Very good ○: No problem in practical use △: Good improvement in practical use but not a big problem ×: Problem in practical use
[0057]
[Table 1]

[0058]
As apparent from Table 1, No. 1 prepared in a vacuum space. 1 panel and dry N₂No. produced in the atmosphere. In panel 2 the H to phosphor₂O, CO₂Therefore, a stable discharge can be realized over a long period of time, with a very large initial voltage margin and almost no change in margin. In contrast, CO₂No. 1 was used for impurity gas adsorption. 3, no. In panel No. 4, no. 1, no. Compared to panel 2, the number of discharge mistakes decreased. As a result, CO₂It can be seen that discharge mistakes can be reduced by adsorbing. However, on the other hand, CO₂No. 1 produced in a 1% atmosphere. In the panel No. 4, it was found that the initial voltage margin was small and the luminance was reduced at the same time. CO₂The number of peak molecules up to 500 degrees¹⁵It has been confirmed by the present inventors that this luminance degradation greatly occurs at the boundary of the number of pieces / g.
[0059]
Therefore, CO to phosphor₂Adsorption amount of 1 × 10 at the peak number of molecules up to 500 degrees¹³Piece / g ~ 1 × 10¹⁵By performing in the range of pieces / g, the number of discharge mistakes can be reduced without incurring significant luminance deterioration.
[0060]
N₂CO in the atmosphere₂0.1% and H₂No. 2 prepared by adding 3 Torr and 30 Torr with partial pressure of O. 5 and No. In 6 panels, CO₂No. with only 0.1% added. Compared with the panel 3, the voltage margin is not greatly reduced, and the effect of reducing the lighting voltage and improving the luminance can be obtained. However, H₂No. added with 30 Torr of O In the panel No. 6, the amount of change in the margin is large, and long-term stable discharge is difficult. The amount of change in the margin is 5 × 10 5 for the number of peak molecules adsorbed on the phosphor.¹⁵It has been confirmed by the present inventors that the voltage margin is reduced when the number of particles / g or more is increased.
[0061]
Therefore, H to phosphor₂The adsorption amount of O is 1 × 10 in terms of the number of peak molecules at 300 ° C. or more.¹⁵Piece / g ~ 5 × 10¹⁶By setting the number per unit / g, the discharge voltage can be reduced without causing a significant decrease in the voltage margin due to panel lighting. Thereby, stable discharge is possible over a long period of time with high brightness, and the discharge voltage can be lowered.
[0062]
In the present embodiment, CO₂And H₂By adsorbing O together, it has the effect of each adsorbed gas, and also CO₂, H₂It was confirmed that the luminance was not improved by the impurity gas adsorption of each O alone. This is CO₂Cause of luminance degradation due to H₂This means that it is suppressed by O and CO to the phosphor that causes luminance degradation₂H adsorption site₂It is conceivable that luminance deterioration is reduced because O is adsorbed. At the same time, it is considered that the ultraviolet radiation efficiency of Xe is also increased due to the reduction of the discharge voltage. This H₂CO by O₂The synergistic effect of reducing luminance and improving luminance is₂And H₂It has been confirmed by the present inventors that the ratio of the number of peak molecules with O is greatly related to the ratio of H₂The peak molecular number of O is CO₂It was found that the ratio of to the number of peak molecules was preferably 3.7 to 4.3, and the vicinity of 4.0 was found to be most effective.
[0063]
Here, the number of adsorbed molecules X (pieces / g) is the pumping speed in S / m^Three/ S), the measurement interval time is t (s), the total detected ion current is I (A), the ion current of the molecule to be obtained is J (A), and the pressure at the time of current detection is P (Pa). Is W (g), the gas constant is R, the temperature is T, the Avogadro number is N,
X = {N / (R * T)} * P * S * t * (J / I) /W=2.471*10²⁰This is a value obtained from the formula of × P × S × t × (J / I) / W. In this embodiment, the exhaust speed is 0.19 (m^Three/ S) and data measured at a measurement interval time of 15 (s) are used.
[0064]
As described above, according to the present invention, it is possible to introduce impurity gas other than the inert gas into the panel surface uniformly and with good control, and H as the impurity gas.₂O and CO₂As a result of introducing the impurity gas, it is possible to achieve improvement in characteristics such as lower discharge voltage, stable discharge, higher luminance, higher efficiency, and longer life in the PDP due to the effect of the impurity gas.
[0065]
(Embodiment 2)
Next, a second embodiment of the present invention will be described.
[0066]
In the second embodiment, at least CH during the sealing process or before the sealing process._FourIn order to limit the impurity gas to be adsorbed as in the first embodiment, the front glass substrate is a protective film so as to be surrounded by a dotted line in FIG. After a certain magnesium oxide is formed by vacuum electron beam evaporation, the glass substrate on the back side is 10 in all steps except the impurity gas adsorption step 17 after the phosphor is fired.^-FourVacuum less than Pa or dry N with dew point -60 degrees or less₂The process up to the gas filling step 15 was performed in the atmosphere. Since the process up to the phosphor baking process for the glass substrate on the back side is performed in the atmosphere, vacuum heating is performed at 600 ° C. before the impurity gas adsorption process 17 and the degassing process 18 of the adsorbed gas is performed in the atmosphere. It was. Further, the impurity gas adsorption step 17 is performed when the temperature of the degassing process 18 is lowered.₂O, CH_FourThe desired impurity gas containing is introduced and exposed to this gas atmosphere until the temperature falls to room temperature.
[0067]
In the second embodiment, CH as an impurity gas is used.₂Of peak molecules seen from 0 to 600 degrees in temperature programmed desorption mass spectrometry (TDS) of₂This is based on the finding that there is a correlation with the number of peak molecules observed at 300 ° C. or more, and the same effects as those of the first embodiment can be obtained as described below.
[0068]
In thermal desorption analysis, in addition to the above impurities, CH-based impurities are polymerized, and the mass number is larger._nH_{2n + 2}Methane hydrocarbons and C_nH_2nImpurities such as ethylene hydrocarbons represented by₂The amount of adsorbed had a large correlation with the discharge characteristics. This seems to be because lower molecules are most susceptible to discharge. In the temperature programmed desorption analysis, CH_FourSince O becomes an interfering ion at the same mass number,_FourSince it is difficult to measure the adsorption amount of CH, CH₂Adsorption amount of CH_FourIt was used as an index of the amount of adsorption.
[0069]
Next, the results of experiments conducted on the gas atmosphere in the impurity gas adsorption step and the amount of adsorption of the impurity gas on the blue phosphor after completion of the panel will be described. Table 2 shows the results. In addition, the meaning of each item in Table 2 is the same meaning as the said Table 1, and abbreviate | omits description.
[0070]
[Table 2]

[0071]
As is apparent from Table 2, NO. 1 panel and dry N₂NO. Made in atmosphere. In panel 2 the H to phosphor₂O, CH_FourTherefore, a stable discharge can be realized over a long period of time, with a very large initial voltage margin and almost no change in margin. In contrast, CH_FourNO. 3, NO. In the panel No. 4, NO. 1, NO. Compared to panel 2, the number of discharge mistakes decreased. However, on the other hand, CH_FourNO. 1 made in a 1% atmosphere. In the panel No. 4, a decrease in voltage margin and a decrease in luminance are simultaneously observed. CH₂The number of peak molecules from 100 degrees to 600 degrees of the adsorption amount is 2 × 10¹⁵It has been confirmed by the present inventors that this luminance degradation greatly occurs at the boundary of the number of pieces / g.
[0072]
Therefore, CH to phosphor₂Adsorption amount of 0.5 × 10 in terms of the number of peak molecules from 100 degrees to 600 degrees¹⁴Piece / g ~ 3.0 × 10¹⁴By performing in the range of pieces / g, the number of discharge mistakes can be reduced without incurring significant luminance deterioration.
[0073]
N₂CH in the atmosphere_Four0.1% and H₂NO. 2 prepared by adding 3 Torr and 30 Torr at a partial pressure. 5 and NO. In 6 panels, CH_FourNO. With 0.1% added only. Compared with the panel 3, the voltage margin is not greatly reduced, and the effect of reducing the lighting voltage and improving the luminance can be obtained. However, H₂NO. With O added at 30 Torr. As for the panel No. 6, the margin decreases greatly with lighting, and stable discharge for a long time is difficult.
[0074]
The decrease in voltage margin due to lighting is caused by the adsorption of H on the phosphor.₂The number of peak molecules appearing at 300 ° C. or higher is 5 × 10¹⁵It has been confirmed by the present inventors that the voltage margin is reduced when the number of particles / g or more is increased. Therefore, H to phosphor₂The adsorption amount of O is 1 × 10 in terms of the number of peak molecules at 300 ° C. or more.¹⁵Piece / g ~ 5 × 10¹⁶By setting the number per unit / g, the discharge voltage can be reduced without causing a large decrease in the voltage margin due to the panel lighting. Thereby, stable discharge is possible over a long period of time with high brightness, and the discharge voltage can be lowered.
[0075]
In this embodiment, CH_FourAnd H₂By adsorbing O together, each adsorbed gas has an effect, and further CH_Four, H₂It was confirmed that the luminance was not improved by the impurity gas adsorption of each O alone. This is CH_FourCause of luminance degradation due to H₂This means that it is suppressed by O, and CH to the phosphor that causes luminance degradation_FourH at the adsorption site₂It is considered that luminance deterioration is reduced by adsorption of O. At the same time, it is considered that the ultraviolet radiation efficiency of Xe is also increased due to the reduction of the discharge voltage. However, H₂CH by O_FourThe synergistic effect of reducing luminance and improving luminance is CH_FourCH as an index of the amount of adsorption₂The peak number of molecules appearing between 100 and 600 degrees and H appearing at 300 degrees or more₂It has been confirmed by the present inventors that the ratio of the number of peak molecules of O is greatly related, and as shown in FIG.₂The peak number of molecules that appear at 300 degrees or more of O is CH₂As a ratio to the number of peak molecules appearing between 100 degrees and 600 degrees, it is particularly effective when it is 0.05 or less, and conversely, when it is 0.05 or more, the luminance decreases.
[0076]
H appears at 300 degrees or more₂The peak molecular number of O is 5 × 10¹⁵In the case of the number per unit / g or more, the slope of the brightness decrease when the ratio of the adsorption amount is 0.05 or more was gentle, but H appears at 300 degrees or more.₂The peak molecular number of O is 5 × 10¹⁵When the number of particles / g or less, there is a tendency that the slope of luminance decrease with the increase of the ratio becomes stronger.
[0077]
From the above, in order to improve the luminance without reducing the voltage margin, H appears at 300 degrees or more.₂The peak molecular number of O is 5 × 10¹⁵Most preferably, the ratio of the adsorption amount is 0.05 or less at the number of particles / g or less.
[0078]
Note that FIG.₂Desorption H appearing in the region of 300 ° C. or higher in the result of analyzing the adsorption amount of O by the temperature programmed desorption analysis method₂Desorption CH appearing in the region of 100 to 600 degrees with respect to the peak molecular number of O₂It is a figure which shows the relationship between the ratio of the number of peak molecules, and brightness | luminance.
[0079]
As described above, according to the present invention, H is used as the impurity gas.₂O and CH_FourAs a result of introducing the impurity gas, it is possible to achieve improvement in characteristics such as lower discharge voltage, stable discharge, higher luminance, higher efficiency, and longer life in the PDP due to the effect of the impurity gas.
[0080]
In the above description, BaMgAl is used as the blue phosphor._TenO₁₇: The case where Eu is used has been described as an example, but is disclosed in Japanese Patent Laid-Open No. 2000-226574 (Ba_1-mSr_m) IMgAl_jO_n: Eu_k0 ≦ m ≦ 0.25, 1.0 ≦ i ≦ 1.8, 12.7 ≦ j ≦ 21.0, 0.01 ≦ k ≦ 0.20, 21.0 ≦ n ≦ 34. When an aluminate having a composition of 5 is used, H₂Since the adsorption characteristics of O approach the characteristics of red and green phosphors, the effect of further facilitating control of impurity gas adsorption can be obtained.
[0081]
【The invention's effect】
As described above, according to the present invention, an impurity gas other than an inert gas can be uniformly introduced into the panel surface with good control, and due to the effect of the impurity gas, the discharge voltage in the PDP can be reduced. Improvements in characteristics such as stable discharge, high brightness, high efficiency, and long life can be realized.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a plasma display panel according to an embodiment of the present invention.
FIG. 2 is a manufacturing process diagram in the same plasma display panel manufacturing method.
FIG. 3 shows H in the impurity gas adsorption process.₂Characteristic diagram showing the amount of each phosphor adsorbed with respect to O partial pressure
FIG. 4 H₂CH for peak molecular number of O₂Diagram showing the relationship between the ratio of the number of peak molecules and the luminance
[Explanation of symbols]
1, 5 substrate
2 display electrodes
3 Dielectric layer
4 Protective film
7 Address electrodes
9 Phosphor layer

Claims (10)

A pair of substrates are arranged so as to face each other so that a space is formed between them, and a peripheral part is sealed with a sealing member, and an electrode is arranged on the substrate so that discharge is generated in the space, and light is emitted by discharge In a plasma display panel provided with a body layer, the phosphor layer has a blue phosphor, and the amount of CO ₂ adsorbed to the blue phosphor ranges from 0 to 500 degrees in the temperature programmed desorption analysis method. A plasma display panel having a peak molecular number of desorbed CO ₂ appearing in the region of 1 × 10 ¹⁵ / g or less (not including 0) . The amount of CO ₂ adsorbed on the blue phosphor is such that the number of desorbed CO ₂ peak molecules appearing in the region from 0 to 500 degrees in the temperature programmed desorption analysis method is 1 × 10 ¹³ molecules / g or more and 1 × 10. The plasma display panel according to claim 1, wherein the number is ¹⁵ pieces / g or less. A pair of substrates are arranged so as to face each other so that a space is formed between them, and a peripheral part is sealed with a sealing member, and an electrode is arranged on the substrate so that discharge is generated in the space, and light is emitted by discharge In a plasma display panel provided with a body layer, the phosphor layer has a blue phosphor, and the adsorption amount of H ₂ O to the blue phosphor is a region of 300 ° C. or more in the temperature programmed desorption analysis method Desorption H ₂ O appears at a peak molecular number of 1 × 10 ¹⁵ molecules / g or more and 5 × 10 ¹⁵ molecules / g or less, and the adsorption amount of CO ₂ appears in a region from 0 to 500 degrees. _2. The plasma display panel according to claim 1, wherein the number of CO ₂ peak molecules is 1 × 10 ¹³ molecules / g or more and 1 × 10 ¹⁵ molecules / g or less. A pair of substrates are arranged so as to face each other so that a space is formed between them, and a peripheral part is sealed with a sealing member, and an electrode is arranged on the substrate so that discharge is generated in the space, and light is emitted by discharge In a plasma display panel provided with a body layer, the phosphor layer has a blue phosphor, and the adsorption amount of H ₂ O to the blue phosphor is a region of 300 ° C. or more in the temperature programmed desorption analysis method The plasma is characterized in that the peak molecular number of desorbed H ₂ O appearing in is 3.7 to 4.3 times the peak molecular number of desorbed CO ₂ appearing in the region from 0 to 500 degrees. Display panel. The amount of H ₂ O adsorbed on the blue phosphor is determined by the desorption H ₂ O peak molecular number appearing in the region of 300 ° C. or higher in the temperature programmed desorption analysis method. the plasma display panel of claim 4, wherein a is less than 4.1 times 3.9 times or more the number of peak molecular away CO _2. A pair of substrates are arranged so as to face each other so that a space is formed between them, and a peripheral part is sealed with a sealing member, and an electrode is arranged on the substrate so that discharge is generated in the space, and light is emitted by discharge In a plasma display panel provided with a body layer, the phosphor layer has a blue phosphor, and the amount of CH ₄ adsorbed on the blue phosphor ranges from 100 degrees to 600 degrees in the temperature programmed desorption analysis method. A plasma display panel, wherein the number of peak molecules of desorbed CH ₂ appearing in the region is 3.0 × 10 ¹⁴ molecules / g or less (not including 0) . The amount of CH ₄ adsorbed on the blue phosphor is such that the peak molecular number of desorbed CH ₂ that appears in the region from 100 to 600 degrees in the temperature programmed desorption analysis method is 0.5 × 10 ¹⁴ molecules / g or more 3 The plasma display panel according to claim 6, wherein the number is 0.0 × 10 ¹⁴ pieces / g or less. A pair of substrates are arranged so as to face each other so that a space is formed between them, and a peripheral part is sealed with a sealing member, and an electrode is arranged on the substrate so that discharge is generated in the space, and light is emitted by discharge In a plasma display panel provided with a body layer, the phosphor layer has a blue phosphor, and the adsorption amount of H ₂ O to the blue phosphor is a region of 300 ° C. or more in the temperature programmed desorption analysis method leaving H ₂ O peak number of molecules is equal to or less than 1 × 10 ¹⁵ cells / g or more 5 × 10 ¹⁵ cells / g, and the adsorption amount of CH ₄ to blue phosphors, Atsushi Nobori spectroscopy appearing in The peak molecular number of desorbed CH ₂ appearing in the region from 100 ° to 600 ° in FIG. 6 is 0.5 × 10 ¹⁴ molecules / g or more and 3.0 × 10 ¹⁴ molecules / g or less. 2. A plasma display panel according to 1. A pair of substrates are arranged so as to face each other so that a space is formed between them, and a peripheral part is sealed with a sealing member, and an electrode is arranged on the substrate so that discharge is generated in the space, and light is emitted by discharge In a plasma display panel provided with a body layer, the phosphor layer has a blue phosphor, and the adsorption amount of H ₂ O to the blue phosphor is a region of 300 ° C. or more in the temperature programmed desorption analysis method The ratio of the peak molecular number of desorbed CH ₂ appearing in the region from 100 degrees to 600 degrees with respect to the peak molecular number of desorbed H ₂ O appearing in is 0.05 or less (not including 0). Plasma display panel. A pair of substrates are arranged so as to face each other so that a space is formed between them, and a peripheral part is sealed with a sealing member, and an electrode is arranged on the substrate so that discharge is generated in the space, and light is emitted by discharge In a plasma display panel provided with a body layer, the phosphor layer has a blue phosphor, and the adsorption amount of H ₂ O to the blue phosphor is a region of 300 ° C. or more in the temperature programmed desorption analysis method leaving H ₂ O peak number of molecules is equal to or less than 1 × 10 ¹⁵ cells / g or more 5 × 10 ¹⁵ cells / g, and the adsorption amount of of H ₂ O to a blue phosphor appearing in the Atsushi Nobori analysis The ratio of the peak molecular number of desorbed CH ₂ appearing in the region from 100 ° to 600 ° to the peak molecular number of desorbed H ₂ O appearing in the region of 300 ° or more in the method is 0.05 or less (not including 0) Plasma display characterized by Panel.

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