JPH0221592A - Luminous particle for electroluminescence element - Google Patents
Luminous particle for electroluminescence elementInfo
- Publication number
- JPH0221592A JPH0221592A JP63169788A JP16978888A JPH0221592A JP H0221592 A JPH0221592 A JP H0221592A JP 63169788 A JP63169788 A JP 63169788A JP 16978888 A JP16978888 A JP 16978888A JP H0221592 A JPH0221592 A JP H0221592A
- Authority
- JP
- Japan
- Prior art keywords
- polymethyl methacrylate
- particle
- luminous
- luminescent particles
- particles
- 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 44
- 238000005401 electroluminescence Methods 0.000 title abstract 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 19
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 19
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000011230 binding agent Substances 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract description 3
- 239000003989 dielectric material Substances 0.000 abstract description 3
- 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 abstract description 2
- 230000001066 destructive effect Effects 0.000 abstract 1
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000010419 fine particle Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910052984 zinc sulfide Inorganic materials 0.000 description 3
- 239000005083 Zinc sulfide Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical group [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 2
- 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
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 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
- 239000011859 microparticle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 150000004763 sulfides Chemical class 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、液晶デイスプレィの
光源あるいは文字や図形の表示に使用される。<Prior Art> Distributed 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、外部からの水分や
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 is reliably sealed with a resin film in a dry atmosphere to prevent water and humidity from outside. It is necessary to prevent intrusion.
したがって、従来の発光粒子を使用して電界発光素子を
製造する場合、材料の処理や封止の工程の管理が難しく
、このような工程の管理が充分になされないと、輝度や
寿命の点で素子の信頼性が低下することになる。Therefore, when manufacturing electroluminescent devices using conventional luminescent particles, it is difficult to control the material processing and sealing processes, and if these processes are not well controlled, brightness and lifespan may be affected. The reliability of the device will decrease.
本発明は、上述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上することによって、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減することを課題とする。The present invention has been made in view of the above-mentioned problems, and by improving the moisture resistance of the luminescent particles themselves, the decomposition and deterioration of the luminescent particles due to surrounding moisture and moisture can be suppressed, and the electroluminescent elements can be improved. The goal is to increase brightness and extend life, as well as reduce the burden of managing the manufacturing process.
く課題を解決するための手段〉
本発明は、上記の課題を達成するために、硫化物の粒子
の表面にポリメチルメタクリレートの被膜を形成して電
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-mentioned problems, the present invention constitutes luminescent particles for an electroluminescent device by forming a polymethyl methacrylate coating on the surface of sulfide particles.
〈作用〉
上記の構成によると、発光粒子は、その表面がポリメチ
ルメタクリレートの被膜に覆われているので、この被膜
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
になって耐湿性が向上し、分解劣化が抑制される。<Function> According to the above structure, the surface of the luminescent particles is covered with a film of polymethyl methacrylate, so this film prevents water and moisture from entering from the outside, resulting in moisture resistance. and decomposition and deterioration are 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ｌ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しのである。The electroluminescent device 1 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 with film 6.6 and sealed.
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有機誘電体
物質からなるバインダ４ａ中に発光粒子４ｂ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 luminescent layer 4 is made by dispersing luminescent particles 4b in a binder 4a made of an 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上にイン
ジウム・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 indium tin oxide (ITO) or the like 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。In the present invention, the luminescent particles 4b contained in the luminescent layer 4 are sulfides, such as ZnS and CaS.
ＳｒＳを主成分とするものであり１、かつその粒子４ｂ
表面にポリメチルメタクリレートの被膜４ｃが形成され
ている点に特徴がある。The main component is SrS 1, and its particles 4b
It is characterized in that a polymethyl methacrylate coating 4c is formed on the surface.
前記の被膜４ｃは、以下に述べるような工程により、形
成される。The coating 4c described above is formed by the steps described below.
まず、発光粒子４ｂに対して、その粒径の１／１０〜ｌ
／１００程度の粒径のポリメチルメタクリレートの微粒
子を用意する。そして、所要量のポリメチルメタクリレ
ートの微粒子を秤量する。First, for the luminescent particles 4b, 1/10 to 1 of the particle size of the luminescent particles 4b.
Fine particles of polymethyl methacrylate having a particle size of about /100 are prepared. Then, a required amount of polymethyl methacrylate microparticles is weighed.
発光粒子４ｂの一定量とポリメチルメタクリレートの微
粒子の一定量とをガラス瓶等の容器に投入し、容器を振
って、両者を混合する。この混合により、両者に静電気
が発生し、静電気による吸引力で、発光粒子４ｂの表面
にポリメチルメタクリレートの微粒子が付着する。A certain amount of luminescent particles 4b and a certain amount of polymethyl methacrylate fine particles are put into a container such as a glass bottle, and the container is shaken to mix the two. Due to this mixing, static electricity is generated between the two, and the fine particles of polymethyl methacrylate adhere to the surface of the luminescent particles 4b due to the attractive force caused by the static electricity.
このように発光粒子４ｂとポリメチルメタクリレートの
微粒子とを充分に混合したのち、これらを乳鉢に入れて
すり潰しを行う。このすり潰しで、発光粒子４ｂに付着
したポリメチルメタクリレートの微粒子にせん断力が加
わり、発光粒子４ｂの表面にポリメチルメタクリレート
がコーティングされることになり、ポリメチルメタクリ
レートの被膜４Ｃができる。After the luminescent particles 4b and the fine particles of polymethyl methacrylate are sufficiently mixed in this way, they are placed in a mortar and ground. This grinding applies shearing force to the polymethyl methacrylate particles attached to the luminescent particles 4b, and the surfaces of the luminescent particles 4b are coated with polymethyl methacrylate, forming a polymethyl methacrylate coating 4C.
上記のようにして表面にポリメチルメタクリレートの被
膜４ｃが形成された発光粒子４ｂでは、被膜４ｃが粒子
４ｂ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。In the luminescent particles 4b on which the polymethyl methacrylate coating 4c is formed on the surface as described above, the coating 4c prevents water and humidity from entering inside the particle 4b.
Improves moisture resistance.
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
による封止の工程は、従来と同様に行うが、発光粒子４
ｂ自体の耐湿性が向上しているので、各工程の管理は特
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 sealing process is carried out in the same manner as before, but the luminescent particles 4
Since the moisture resistance of b itself is improved, it is not necessary to control each step particularly strictly, and the control conditions can be significantly lowered.
〈発明の効果〉
以上のように、本発明によれば、ポリメチルメタクリレ
ートの被膜により発光粒子の耐湿性が向上するので、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 coating of polymethyl methacrylate, so that it is possible to increase the brightness and extend the life of an electroluminescent device using the polymethyl methacrylate 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である。
ｌ・・・電界発光素子、４・・・発光層、４ｂ・・・発
光粒子、４Ｃ・・・ポリメチルメタクリレートの被膜。FIG. 1 is a sectional view of an electroluminescent device containing luminescent particles of the present invention, and FIG. 2 is an enlarged sectional view of the luminescent layer portion thereof. 1... Electroluminescent element, 4... Luminescent layer, 4b... Luminescent particles, 4C... Polymethyl methacrylate coating.
Claims (1)
トの被膜を形成したこ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 a polymethyl methacrylate coating is formed on the surface of sulfide particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63169788A JPH0221592A (en) | 1988-07-07 | 1988-07-07 | Luminous particle for electroluminescence element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63169788A JPH0221592A (en) | 1988-07-07 | 1988-07-07 | Luminous particle for electroluminescence element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0221592A true JPH0221592A (en) | 1990-01-24 |
Family
ID=15892888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63169788A Pending JPH0221592A (en) | 1988-07-07 | 1988-07-07 | Luminous particle for electroluminescence element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0221592A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0855680A (en) * | 1994-08-12 | 1996-02-27 | Nec Kansai Ltd | Electroluminescent lamp and manufacture thereof |
-
1988
- 1988-07-07 JP JP63169788A patent/JPH0221592A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0855680A (en) * | 1994-08-12 | 1996-02-27 | Nec Kansai Ltd | Electroluminescent lamp and manufacture thereof |
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