JPH01315989A - Light emitting particle for electroluminescence element - Google Patents
Light emitting particle for electroluminescence elementInfo
- Publication number
- JPH01315989A JPH01315989A JP63146614A JP14661488A JPH01315989A JP H01315989 A JPH01315989 A JP H01315989A JP 63146614 A JP63146614 A JP 63146614A JP 14661488 A JP14661488 A JP 14661488A JP H01315989 A JPH01315989 A JP H01315989A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- particle
- moisture
- emitting particle
- film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002245 particle Substances 0.000 title claims abstract description 51
- 238000005401 electroluminescence Methods 0.000 title abstract 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 239000002253 acid Substances 0.000 abstract description 7
- 238000000354 decomposition reaction Methods 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000010306 acid treatment Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000007598 dipping method Methods 0.000 abstract description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 7
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 239000005083 Zinc sulfide Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical group [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- KXJGSNRAQWDDJT-UHFFFAOYSA-N 1-acetyl-5-bromo-2h-indol-3-one Chemical compound BrC1=CC=C2N(C(=O)C)CC(=O)C2=C1 KXJGSNRAQWDDJT-UHFFFAOYSA-N 0.000 description 1
- 125000001731 2-cyanoethyl group Chemical group [H]C([H])(*)C([H])([H])C#N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920001218 Pullulan Polymers 0.000 description 1
- 239000004373 Pullulan Substances 0.000 description 1
- -1 ZnS Chemical compound 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 235000019423 pullulan Nutrition 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- WGPCGCOKHWGKJJ-UHFFFAOYSA-N sulfanylidenezinc Chemical group [Zn]=S WGPCGCOKHWGKJJ-UHFFFAOYSA-N 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、電界発光素子の発光層に分散混入される発光
粒子に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to luminescent particles dispersed and mixed in a luminescent layer of an electroluminescent device.
〈従来の技術〉
分散型の電界発光素子は、例えば、液晶デ′イスプレイ
の光源あるいは文字や図形の表示に使用される。<Prior Art> Dispersed electroluminescent elements are used, for example, as a light source for liquid crystal displays or for displaying characters and figures.
この電界発光素子は、背面電極と、絶縁層と、発光層と
、透明電極とを順次積層し、この積層体の外側を透明樹
脂フィルムで被覆して封止した構造となっている。This electroluminescent device has a structure in which a back electrode, an insulating layer, a light emitting layer, and a transparent electrode are sequentially laminated, and the outside of this laminated body is covered and sealed with a transparent resin film.
前記発光層は、有機誘電体からなるバインダ中に発光粒
子を分散混入して構成されており、発光粒子は、通常、
硫化亜鉛を主成分としている。The luminescent layer is composed of luminescent particles dispersed in a binder made of an organic dielectric, and the luminescent particles are usually
The main ingredient is zinc sulfide.
この電界発光素子は、背面電極と透明電極との間に電圧
を印加することによって、発光層中の発光粒子が励起さ
れて発光する。In this electroluminescent element, by applying a voltage between a back electrode and a transparent electrode, luminescent particles in a luminescent layer are excited and emit light.
〈発明が解決しようとする課題〉
ところで、硫化亜鉛系の発光粒子は、周囲に水分が存在
すると、これを吸収して分解劣化し、これにより、素子
の輝度が低下するばかりでなく、素子の寿命が短くなる
、という問題がある。<Problems to be Solved by the Invention> By the way, zinc sulfide-based luminescent particles absorb moisture and decompose and deteriorate when moisture is present in the surroundings, which not only reduces the brightness of the device but also damages the device. The problem is that the lifespan is shortened.
そのため、電界発光素子の製造に当たって、該素子を構
成する各材料について、原料の段階で予め真空乾燥によ
り充分に乾燥し、素子中の含有水分量を可及的減少させ
ておく必要がある。Therefore, in manufacturing an electroluminescent device, it is necessary to thoroughly dry each material constituting the device by vacuum drying at the raw material stage to reduce the amount of water contained in the device as much as possible.
また、発光粒子を分散混入した発光層と絶縁層等とを積
層した後は、乾燥雰囲気中で、この積層体に対して樹脂
フィルムによる封止を確実に行って、外部から水分や湿
気の侵入を防止する必要がある。In addition, after laminating a luminescent layer containing dispersed luminescent particles and an insulating layer, etc., the laminate must be reliably sealed with a resin film in a dry atmosphere to prevent moisture from entering from the outside. It is necessary to prevent this.
したがって、従来の発光粒子を使用して電界発光粒子を
製造する場合、材料の処理や封止の工程の管理が＠Ｇ
Ｌ ＜、このような工程の管理が充分になされないと、
輝度や寿命の点て素子の信頼性が低下することになる。Therefore, when manufacturing electroluminescent particles using conventional luminescent particles, the management of material processing and sealing processes is
L <, if such processes are not adequately controlled,
The reliability of the device will decrease in terms of brightness and lifetime.
本発明は、」二連の問題点に鑑みてなされたものであっ
て、発光粒子自体の耐湿性を向」二することによって、
周囲の水分や湿気による発光粒子の分解劣化を抑制し、
電界発光素子の高輝度化、長寿命化を図るとともに、製
造工程の管理の負担を軽猷４”ろことを課題とする。The present invention was made in view of two problems, and by improving the moisture resistance of the luminescent particles themselves,
Suppresses decomposition and deterioration of luminescent particles due to surrounding water and humidity,
The goal is to increase the brightness and extend the lifespan of electroluminescent devices, and to reduce the burden of manufacturing process management to a lighter 4” rotor.
く課題を解決するだめの手段〉
本発明は、上記の課題を達成するために、硫化物の粒子
の表面に酸化物被膜を形成して電界発光素子用発光粒子
を構成した。Means for Solving the Problems> In order to achieve the above problems, the present invention forms luminescent particles for an electroluminescent device by forming an oxide film on the surface of sulfide particles.
〈作用〉
上記の構成によると、発光粒子は、その表面が酸化物被
膜に覆われているので、この酸化物被膜によって外部か
らの水分や湿気の侵入が阻止されることになって耐湿性
か向１−シ、分解劣化が抑制されろ。<Function> According to the above structure, the surface of the luminescent particles is covered with an oxide film, and this oxide film prevents water and humidity from entering from the outside, making them moisture resistant. First, decomposition and deterioration should be suppressed.
この酸化物被膜（Ｊ、発光粒子が硫化亜鉛の例で説明す
ると、硫化亜鉛の結晶構造が立方晶の閃亜鉛鉱型構造を
とっているため、へき開面が（Ｉ １１）方向であり、
亜鉛が析出しやすく、その表面の亜鉛と反応して酸化物
を作るものと思われる。To explain this oxide film (J) using an example in which the luminescent particles are zinc sulfide, the crystal structure of zinc sulfide is a cubic zincblende structure, so the cleavage plane is in the (I 11) direction,
It is thought that zinc tends to precipitate and reacts with the zinc on the surface to form oxides.
また、酸化物被膜の形成時に、粒子表面のＯＨＭが除去
されるので、これによっても、発光粒子の分解劣化が抑
制される。Further, since OHM on the particle surface is removed during the formation of the oxide film, decomposition and deterioration of the luminescent particle is also suppressed.
〈実施例〉
以下、本発明を図面に示す実施例に基づいて詳細に説明
する。<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings.
第１図は本発明の一実施例に係る発光粒子を含む電界発
光素子の断面図である。FIG. 1 is a cross-sectional view of an electroluminescent device containing luminescent particles according to an embodiment of the present invention.
この実施例の電界発光素子Ｉは、従来の電界発光素子と
同様に、背面電極２と、絶縁層３と、発光層４と、透明
電極５とを順次積層し、この積層体を透明の樹脂フィル
ム６．６で被覆して封止したものである。The electroluminescent device I of this embodiment, like the conventional electroluminescent device, has a back electrode 2, an insulating layer 3, a light emitting layer 4, and a transparent electrode 5 successively laminated, and this laminate is made of transparent resin. It was covered and sealed with film 6.6.
背面電極２は、アルミニウム等の金属箔で構成されてい
る。絶縁層３は、有機誘電体物質中にチタン酸バリウム
の粉末を混合したものである。発光層４は、第２図に示
すように、シアノエチルセルローズのようなａ機誘電体
物質からなるハイフタ４ａ中に発光粒子４ｈを分散混入
したものである。The back electrode 2 is made of metal foil such as aluminum. The insulating layer 3 is a mixture of barium titanate powder in an organic dielectric material. As shown in FIG. 2, the light-emitting layer 4 includes light-emitting particles 4h dispersed in a high lid 4a made of an a-organic dielectric material such as cyanoethyl cellulose.
透明電極５は、透明樹脂のベースフィルム５ａ」−にイ
ンノウム・錫酸化物（ＩＴＯ）等の電極膜５ｂを被着し
て構成されている。The transparent electrode 5 is constructed by depositing an electrode film 5b made of innoum tin oxide (ITO) on a base film 5a made of transparent resin.
そして、本発明においては、発光層４中に含まれる発光
粒子４ｂが、硫化物、たとえばＺｎＳ、 ＣａＳ、Ｓｒ
Ｓを主成分とするものであり、かつ、その粒子表面に酸
化物被膜／１． ｃが形成されている点に特徴がある。In the present invention, the luminescent particles 4b contained in the luminescent layer 4 are made of sulfide, such as ZnS, CaS, Sr.
The main component is S, and the particle surface has an oxide coating/1. It is characterized by the formation of c.
前記酸化物被膜４Ｃは、原料としての発光粒子４ｂを硝
酸、塩酸等の酸液中に浸ａ（ディッピング）することに
より形成される。この酸処理における酸濃度（Ｊ１硝酸
の場合、００５Ｎ〜３Ｎであることが望ましい。また、
その処理時間、温度は、酸の濃度に応じて適宜決定すれ
ばよい。さらに、塩酸の場合、その濃度は０．０５Ｎ〜
２Ｎであることが望ましく、そのときの処理時間、温度
については、硝酸の場合と同様に、酸の濃度に応じて適
宜決定すればよい。The oxide film 4C is formed by dipping the luminescent particles 4b as a raw material in an acid solution such as nitric acid or hydrochloric acid. The acid concentration in this acid treatment (in the case of J1 nitric acid, it is desirable to be 005N to 3N.
The treatment time and temperature may be appropriately determined depending on the concentration of the acid. Furthermore, in the case of hydrochloric acid, its concentration is 0.05N~
2N is desirable, and the treatment time and temperature at that time may be determined as appropriate depending on the concentration of the acid, as in the case of nitric acid.
酸処理した発光粒子４ｂは、純水により洗浄した後、真
空乾燥器により乾燥を行う。The acid-treated luminescent particles 4b are washed with pure water and then dried in a vacuum dryer.
」二組のように酸処理することに上り表面に酸化物被膜
４ｃが形成された発光粒子４ｂは、酸化物被膜４ｃが粒
子内部への水分や湿気の侵入を阻止することになり、耐
湿性が向上する。The luminescent particles 4b, which have been acid-treated and have an oxide film 4c formed on their surfaces, as shown in the second set, have moisture resistance because the oxide film 4c prevents moisture from entering inside the particles. will improve.
また、この酸処理工程において発光粒子４ｂの表面部の
Ｏｒ−Ｉ基が除去されるので、たとえ発光粒子４ｂに水
分が付着することになっても、分解劣化しにくい。In addition, since the Or-I group on the surface of the luminescent particles 4b is removed in this acid treatment step, even if moisture is attached to the luminescent particles 4b, they are unlikely to decompose and deteriorate.
この発光粒子４ｂの発光層４中への分散混入の工程や、
発光層４と絶縁層３等との積層の工程、樹脂フィルム６
による封止の二［程は、従来と同様に行うが、発光粒子
４ｂ自体の耐湿性が向上しているので、各］二程の管理
は特に厳密に行う必要はなく、管理条件は大幅に切り下
げてよい。A step of dispersing and mixing the luminescent particles 4b into the luminescent layer 4,
Lamination process of light emitting layer 4 and insulating layer 3 etc., resin film 6
The second step of sealing is carried out in the same manner as before, but since the moisture resistance of the luminescent particles 4b itself has been improved, the second step does not need to be particularly strictly controlled, and the control conditions can be changed significantly. You can devalue it.
なお、発光粒子に固有の発光色をもたせるために、発光
粒子には所要の物質（緑色の発光色の場合では銅）が含
有させる。Note that in order to give the luminescent particles a unique luminescent color, the luminescent particles contain a required substance (copper in the case of green luminescent color).
次に実験例について説明する。Next, an experimental example will be explained.
実験では、発光粒子としてＺｎＳの粒子を用いた。この
ＺｎＳの粒子を、濃度がＩＮである硝酸溶液に５〜ＩＯ
分（溶液の温度２５℃）浸漬し、そののち引き」二げて
純水にて洗浄し、１１０℃で真空乾燥した。In the experiment, ZnS particles were used as luminescent particles. The ZnS particles were placed in a nitric acid solution with a concentration of 5 to IO.
The sample was immersed for 25 minutes (solution temperature: 25°C), then removed, washed with pure water, and dried under vacuum at 110°C.
この粒子を用いてシアノエチルプルランと一緒に混合し
てペーストを作った。The particles were used to make a paste by mixing together with cyanoethyl pullulan.
このペーストからなる分散型の発光層により第１図に示
した構造からなる電界発光素子を構成した。An electroluminescent device having the structure shown in FIG. 1 was constructed using a dispersed light-emitting layer made of this paste.
この電界発光素子を、５０°Ｃ１相対湿度９０％の条件
に設置し、１００Ｖ、 ４００Ｉ（Ｚ（７）電流を通電
したときの相対輝度の経時変化を測定した。This electroluminescent device was installed under conditions of 50° C. and 90% relative humidity, and the change in relative brightness over time was measured when a current of 100 V and 400 I (Z(7)) was applied.
第３図はその測定結果を示すものであり、実線が本発明
によるもの、−点鎖線は未処理の従来例のものである。FIG. 3 shows the measurement results, where the solid line is the one according to the present invention and the dashed-dotted line is the one according to the untreated conventional example.
この測定結果から、本発明によるものは、従来のものよ
り、相対輝度の低下率が小さく、高輝度であることが分
かる。From this measurement result, it can be seen that the device according to the present invention has a lower rate of decrease in relative brightness and higher brightness than the conventional device.
〈発明の効果〉
以上のように、本発明によれば、酸化物被膜により発光
粒子の耐湿性が向」二するので、これを用いた電界発光
素子の高輝度化、長寿命化を図ることができ、電界発光
素子の信頼性を高めることができる。<Effects of the Invention> As described above, according to the present invention, the moisture resistance of the luminescent particles is improved by the oxide coating, so that it is possible to increase the brightness and extend the life of an electroluminescent device using the oxide coating. This makes it possible to improve the reliability of the electroluminescent device.
また、発光粒子自体の耐湿性が向上するため、電界発光
素子の製造過程において、発光粒子や他の材料の扱いや
、樹脂フィルムによる素子の封止を、従来のような厳し
い管理条件のもとで行う必要がなくなり、工程管理の負
担が大幅に軽減される。In addition, the moisture resistance of the luminescent particles themselves is improved, so during the manufacturing process of electroluminescent devices, the handling of luminescent particles and other materials, as well as the sealing of devices with resin films, can be handled under the same strict control conditions as in the past. This eliminates the need to perform this process separately, greatly reducing the burden of process control.
第１図は本発明の発光粒子を含む電界発光素子の断面図
、第２図はその発光層部分の拡大断面図、第３図は実験
例に基づく相対輝度の経時変化を示す図である。
１・・・電界発光素子、４・・発光層、４ｂ・・・発光
粒子、４Ｃ酸化物被膜。FIG. 1 is a cross-sectional view of an electroluminescent device containing light-emitting particles of the present invention, FIG. 2 is an enlarged cross-sectional view of a light-emitting layer portion thereof, and FIG. 3 is a diagram showing changes in relative brightness over time based on experimental examples. 1... Electroluminescent element, 4... Luminescent layer, 4b... Luminescent particle, 4C oxide coating.
Claims (1)
とを特徴とする電界発光素子用発光粒子。(1) Luminescent particles for electroluminescent devices, characterized in that an oxide film is formed on the surface of sulfide particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63146614A JPH01315989A (en) | 1988-06-14 | 1988-06-14 | Light emitting particle for electroluminescence element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63146614A JPH01315989A (en) | 1988-06-14 | 1988-06-14 | Light emitting particle for electroluminescence element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01315989A true JPH01315989A (en) | 1989-12-20 |
Family
ID=15411720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63146614A Pending JPH01315989A (en) | 1988-06-14 | 1988-06-14 | Light emitting particle for electroluminescence element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01315989A (en) |
-
1988
- 1988-06-14 JP JP63146614A patent/JPH01315989A/en active Pending
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