JPH06310276A - Phosphor and dispersed el element using it - Google Patents
Phosphor and dispersed el element using itInfo
- Publication number
- JPH06310276A JPH06310276A JP5100580A JP10058093A JPH06310276A JP H06310276 A JPH06310276 A JP H06310276A JP 5100580 A JP5100580 A JP 5100580A JP 10058093 A JP10058093 A JP 10058093A JP H06310276 A JPH06310276 A JP H06310276A
- Authority
- JP
- Japan
- Prior art keywords
- phosphor
- coupling agent
- pts
- groups
- dispersed
- 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
Landscapes
- Electroluminescent Light Sources (AREA)
- Luminescent Compositions (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、分散型ＥＬなどに使
用される蛍光体に関し、特に蛍光体粒子の吸湿劣化を防
止し、かつ分散媒である有機バインダとの接着性を飛躍
的に向上させた蛍光体およびそれを使用した分散型ＥＬ
素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphor used for a dispersion type EL or the like, and particularly, it prevents deterioration of phosphor particles due to moisture absorption and dramatically improves the adhesiveness with an organic binder as a dispersion medium. Phosphor and dispersed EL using the same
Regarding the device.
【０００２】[0002]
【従来の技術】分散型ＥＬ素子の構成を図２を参照しな
がら説明する。2. Description of the Related Art The structure of a dispersion type EL element will be described with reference to FIG.
【０００３】アルミ箔等よりなる背面電極１上に、絶縁
物（例えばチタン酸バリウム等の高誘電体粉末）および
蛍光体３ａ（例えば硫化亜鉛を銅で付活したもの）をジ
メチルホルムアミド等の有機溶剤で有機バインダ（例え
ばシアノエチルプルラン）を溶解したものの中にそれぞ
れ分散させ、順次塗布して反射絶縁層２、発光層３を形
成する。その上に透明導電フィルム等からなる透明電極
４を設け、上下よりナイロン（デュポン社商標）等の吸
湿フィルム６，６で覆い、さらにフッ素フィルム等で防
湿性の外皮フィルム７，７で密閉封止している。On a back electrode 1 made of aluminum foil or the like, an insulator (for example, high-dielectric powder such as barium titanate) and a phosphor 3a (for example, zinc sulfide activated with copper) and an organic material such as dimethylformamide are used. An organic binder (e.g., cyanoethyl pullulan) is dissolved in a solvent and dispersed in a solvent, and sequentially applied to form the reflective insulating layer 2 and the light emitting layer 3. A transparent electrode 4 made of a transparent conductive film or the like is provided thereon, covered with moisture-absorbing films 6 and 6 such as nylon (trademark of DuPont) from the top and bottom, and further sealed with moisture-proof outer films 7 and 7 such as a fluorine film. is doing.
【０００４】このＥＬ素子の背面電極１と透明電極４の
間に交流電圧を印加すると発光層３中の蛍光体３ａの発
光中心の励起が行われ発光が生じる。When an AC voltage is applied between the back electrode 1 and the transparent electrode 4 of this EL element, the emission center of the phosphor 3a in the light emitting layer 3 is excited and light emission occurs.
【０００５】[0005]
【発明が解決しようとする課題】ところで、上記蛍光体
は、大気中に存在する水分により加水分解を生じて亜鉛
が析出し、輝度が低下する。また、交流電界による熱の
発生や蛍光体の振動により蛍光体−バインダ間の剥離が
生じ、これによりＥＬ素子のインピーダンスが上昇して
入力が減少し、輝度が低下する。By the way, the above-mentioned phosphor is hydrolyzed by moisture present in the atmosphere to deposit zinc, thereby lowering the brightness. Further, heat generated by the AC electric field and vibration of the phosphor cause peeling between the phosphor and the binder, which increases the impedance of the EL element, reduces the input, and lowers the brightness.
【０００６】これらの問題により、冷陰極管ランプ等に
比べ寿命特性が低いという問題があった。Due to these problems, there is a problem that the life characteristics are lower than those of cold cathode fluorescent lamps and the like.
【０００７】そこで、本発明は上記の問題を解決するた
めに、蛍光体の表面を疎水化することにより吸湿を防止
し、またバインダとの密着性を向上させて蛍光体および
ＥＬ素子の輝度低下を抑制し、寿命特性を改善した蛍光
体を提供するものである。Therefore, in order to solve the above problems, the present invention prevents the absorption of moisture by making the surface of the phosphor hydrophobic, and improves the adhesiveness with the binder to reduce the brightness of the phosphor and the EL element. And a phosphor having improved lifetime characteristics.
【０００８】[0008]
【課題を解決するための手段】本発明は、上記の目的を
達成するために、蛍光体表面にアルミネート系またはチ
タネート系のカップリング剤を用いて疎水性表面処理を
施したことを特徴とする。In order to achieve the above object, the present invention is characterized in that a phosphor surface is subjected to a hydrophobic surface treatment using an aluminate-based or titanate-based coupling agent. To do.
【０００９】また、カップリング剤中のＨ原子をＦ原子
に置換したＦ系カップリング剤を用いて疎水性表面処理
を施したことを特徴とする。Further, the present invention is characterized in that a hydrophobic surface treatment is carried out by using an F-based coupling agent in which H atom in the coupling agent is replaced with F atom.
【００１０】[0010]
【作用】無機物である蛍光体粒子は、粒子表面に吸着水
酸基が存在しており、これに大気中の水分が吸着して加
水分解が生じ、亜鉛の析出や二酸化硫黄、水素、酸素、
硫化水素等の気泡が発生し、また交流電界による熱の発
生や蛍光体の振動により蛍光体−バインダ間の剥離が生
じることにより、ＥＬ素子のインピーダンスが上昇して
輝度が低下する。本発明によると蛍光体粒子に疎水性表
面処理を施すことにより吸湿を防止し、加水分解等によ
る輝度低下を抑制し、また蛍光体−バインダ間の接着性
を向上させることにより、剥離等による輝度低下を抑制
し、ＥＬ素子の寿命の改善を実現できる。[Function] The phosphor particles, which are inorganic substances, have adsorbed hydroxyl groups on the surface of the particles, and water in the atmosphere is adsorbed on the adsorbed hydroxyl groups to cause hydrolysis, resulting in precipitation of zinc, sulfur dioxide, hydrogen, oxygen,
Bubbles such as hydrogen sulfide are generated, and heat is generated by an AC electric field and the phosphor is vibrated to cause separation between the phosphor and the binder, thereby increasing the impedance of the EL element and decreasing the brightness. According to the present invention, the phosphor particles are subjected to a hydrophobic surface treatment to prevent moisture absorption, suppress a decrease in brightness due to hydrolysis and the like, and improve the adhesiveness between the phosphor and the binder to improve brightness due to peeling or the like. It is possible to suppress the decrease and to improve the life of the EL element.
【００１１】また、蛍光体に防湿性が付与されるため、
コスト面で非常に高価なフッ素フィルム等の外皮フィル
ムを用いる必要がなく、製造工程の簡略化、コストの削
減が可能となる。Further, since moisture resistance is imparted to the phosphor,
It is not necessary to use a skin film such as a fluorine film, which is very expensive in terms of cost, and the manufacturing process can be simplified and the cost can be reduced.
【００１２】[0012]
【実施例】以下、本発明の蛍光体の表面処理の第１の実
施例について説明する。EXAMPLE A first example of the surface treatment of the phosphor of the present invention will be described below.
【００１３】硫化亜鉛系分散型ＥＬ蛍光体１００重量
部、トルエン等の溶剤４００重量部、チタネート系カッ
プリング剤プレンアクトＫＲ３３８Ｘ（味の素（株）製
商品名）１重量部を混合し、５０℃で１０分間攪拌し、
濾過、その後１１５℃で２時間乾燥した。この処理蛍光
体を用いて従来例と同様にしてＥＬ素子を作成した。100 parts by weight of the zinc sulfide-based dispersion type EL phosphor, 400 parts by weight of a solvent such as toluene, and 1 part by weight of a titanate coupling agent Plenact KR338X (trade name, manufactured by Ajinomoto Co., Inc.) are mixed, and the mixture is mixed at 10 ° C. at 10 ° C. Stir for minutes,
It was filtered and then dried at 115 ° C. for 2 hours. An EL element was prepared using this treated phosphor in the same manner as in the conventional example.
【００１４】ここで用いられるカップリング剤は、イソ
プロパノール基等の加水分解性親水基と疎水性の側鎖有
機官能基からなっている。親水基の働きは、蛍光体表面
の水酸基と反応して共有結合を形成するものであり、疎
水基は極性を選択することにより有機バインダとの濡れ
性を向上させるものである。The coupling agent used here is composed of a hydrolyzable hydrophilic group such as an isopropanol group and a hydrophobic side chain organic functional group. The function of the hydrophilic group is to react with the hydroxyl group on the surface of the phosphor to form a covalent bond, and the hydrophobic group is to improve the wettability with the organic binder by selecting the polarity.
【００１５】本発明により作成した分散型ＥＬ素子の寿
命特性について説明する。The life characteristics of the dispersion type EL device manufactured according to the present invention will be described.
【００１６】図１は分散型ＥＬ素子の寿命特性図であ
る。従来分散型ＥＬ素子の輝度半減時間は、１５０Ｖ−
１ＫＨｚ／５０℃−９０％ＲＨ駆動において１１０時間
程度であったが、本実施例の分散型ＥＬ素子では同一条
件の駆動において１７０時間となり、従来例と比較して
約５５％の寿命改善効果が見られた。FIG. 1 is a life characteristic diagram of the dispersion type EL device. The luminance half time of the conventional dispersion type EL element is 150V-
It was about 110 hours when driven at 1 KHz / 50 ° C. and 90% RH, but it was 170 hours when driven under the same conditions with the dispersion-type EL element of this example, and a life improvement effect of about 55% was obtained compared to the conventional example. I was seen.
【００１７】また、チタネート系カップリング剤をアル
ミネート系カップリング剤に代えても同様の効果が得ら
れる。また、従来から知られているシラン系カップリン
グ剤はカップリング剤中の疎水基と分散媒中の有機官能
基とを反応させて化学結合させなければならず、そのた
めにカップリング剤中の疎水基と分散媒の種類を選択し
なければならないという問題があるのに対し、本発明に
係わるチタネート系、アルミネート系カップリング剤
は、蛍光体など無機物表面の極性、表面エネルギーを変
えることにより、分散媒との濡れ性を向上させるので、
シラン系カップリング剤を用いる場合よりも、蛍光体粒
子を有機バインダ中に分散させる能力に優れている。The same effect can be obtained by replacing the titanate coupling agent with an aluminate coupling agent. In addition, conventionally known silane coupling agents have to chemically react with a hydrophobic group in the coupling agent and an organic functional group in the dispersion medium to cause a chemical bond. While there is a problem that it is necessary to select the type of the group and the dispersion medium, the titanate-based, aluminate-based coupling agent according to the present invention, the polarity of the surface of the inorganic material such as the phosphor, by changing the surface energy, Since it improves the wettability with the dispersion medium,
The ability to disperse the phosphor particles in the organic binder is superior to the case of using the silane coupling agent.
【００１８】[0018]
【実施例２】次に、蛍光体の表面処理の第２の実施例に
ついて説明する。Second Embodiment Next, a second embodiment of the surface treatment of the phosphor will be described.
【００１９】処理剤にチタネート系カップリング剤中の
Ｈ原子をＦ原子に置換したＦ系カップリング剤アトロン
Ｒ−８（日本曹達（株）製、商品名）を使用して、実施
例１と同様にして蛍光体に表面処理を施し、分散型ＥＬ
素子を作成した。Using the F-type coupling agent Atron R-8 (manufactured by Nippon Soda Co., Ltd., trade name) in which the H atom in the titanate-type coupling agent was replaced with the F atom as the treating agent, In the same way, the phosphor is surface-treated and dispersed EL
A device was created.
【００２０】本実施例により作製した分散型ＥＬ素子の
寿命特性を図１に示す。従来例では、輝度半減時間が１
１０時間、実施例１では１７０時間であるのに対し、本
実施例では２２０時間と従来の２倍の輝度半減時間が得
られた。これはＦ原子により防湿性がさらに向上し、蛍
光体の吸湿劣化による亜鉛の析出、黒化を防止すること
ができたためである。FIG. 1 shows the life characteristics of the dispersion type EL device manufactured according to this example. In the conventional example, the brightness half time is 1
In contrast to 10 hours and 170 hours in Example 1, 220 hours was obtained in this example, which is twice as long as the luminance half time of the conventional example. This is because the moisture resistance is further improved by the F atom, and zinc deposition and blackening due to moisture absorption deterioration of the phosphor can be prevented.
【００２１】上記実施例では、カップリング剤で表面処
理した硫化亜鉛系蛍光体を分散型ＥＬ素子に応用した例
について説明したが、本発明の係わる処理方法は硫化亜
鉛に限らず蛍光染料、顔料などにも適用できるし、その
他水分の影響を防止する必要のある蛍光体や、分散媒中
に分散させる蛍光体などであればどのような蛍光体にも
適用できる。In the above embodiment, an example in which the zinc sulfide-based phosphor surface-treated with a coupling agent is applied to a dispersion type EL device has been described. However, the treatment method according to the present invention is not limited to zinc sulfide but a fluorescent dye or pigment. The present invention can also be applied to any other phosphors as long as it is necessary to prevent the influence of moisture, or a phosphor dispersed in a dispersion medium.
【００２２】[0022]
【発明の効果】以上説明したように、本発明は蛍光体表
面にカップリング剤により疎水性表面処理を施すことに
より、蛍光体への水分の吸着を防止することができ、ま
た蛍光体の分散媒である有機バインダとの密着性を向上
することができ、これによりＥＬ素子の寿命の大幅な改
善が実現できるという効果がある。As described above, according to the present invention, adsorption of water to the phosphor can be prevented and the dispersion of the phosphor can be prevented by subjecting the phosphor surface to a hydrophobic surface treatment with a coupling agent. It is possible to improve the adhesiveness with the organic binder that is the medium, and there is an effect that the life of the EL element can be significantly improved.
【００２３】また、蛍光体に防湿性が付与されるため、
非常に高価なフッ素フィルム等の外皮フィルムを用いる
必要がなく、ＥＬ素子の製造工程の簡略化、コストの削
減が可能となる。Since moisture resistance is imparted to the phosphor,
Since it is not necessary to use a very expensive outer film such as a fluorine film, the manufacturing process of the EL element can be simplified and the cost can be reduced.
【図１】 本発明により疎水性表面処理を行った分散型
ＥＬ素子の寿命特性図FIG. 1 is a life characteristic diagram of a dispersion-type EL element subjected to a hydrophobic surface treatment according to the present invention
【図２】 従来の分散型ＥＬ素子の断面図FIG. 2 is a sectional view of a conventional dispersion type EL device.
１ 背面電極 ２ 反射絶縁層 ３ 発光層 ３ａ 蛍光体 ４ 透明電極 ５ 取出し電極 ６ 吸湿フィルム ７ 外皮フィルム 1 Back Electrode 2 Reflective Insulation Layer 3 Light Emitting Layer 3a Phosphor 4 Transparent Electrode 5 Extraction Electrode 6 Moisture Absorption Film 7 Skin Film
Claims (4)
性表面処理を施したことを特徴とする蛍光体。1. A phosphor having a hydrophobic surface treated with a coupling agent on the surface of the phosphor.
アルミネート系カップリング剤であることを特徴とする
請求項１記載の蛍光体。2. The phosphor according to claim 1, wherein the coupling agent is a titanate-based or aluminate-based coupling agent.
Ｈ原子をＦ原子に置換したカップリング剤であることを
特徴とする請求項１記載の蛍光体。3. The phosphor according to claim 1, wherein the coupling agent is a coupling agent in which H atoms in the coupling agent are replaced with F atoms.
３に記載の蛍光体を使用した分散型ＥＬ素子。4. A dispersion type EL device using the phosphor according to claim 1, 2, or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5100580A JPH06310276A (en) | 1993-04-27 | 1993-04-27 | Phosphor and dispersed el element using it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5100580A JPH06310276A (en) | 1993-04-27 | 1993-04-27 | Phosphor and dispersed el element using it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06310276A true JPH06310276A (en) | 1994-11-04 |
Family
ID=14277834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5100580A Pending JPH06310276A (en) | 1993-04-27 | 1993-04-27 | Phosphor and dispersed el element using it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06310276A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09230587A (en) * | 1996-02-20 | 1997-09-05 | Tokyo Ohka Kogyo Co Ltd | Photosensitive pasty composition and formation of insulating patterned layer |
| US7493867B2 (en) | 2005-09-22 | 2009-02-24 | Juki Corporation | Sewing machine |
| JP2009132902A (en) * | 2007-11-08 | 2009-06-18 | Sumitomo Metal Mining Co Ltd | Surface-coated phosphor particle of strontium silicate, method for manufacturing the same and light emitting diode including the same |
| JP2010144111A (en) * | 2008-12-22 | 2010-07-01 | Sumitomo Metal Mining Co Ltd | Sulfide phosphor particle having surface coating layer, and method of manufacturing the same |
-
1993
- 1993-04-27 JP JP5100580A patent/JPH06310276A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09230587A (en) * | 1996-02-20 | 1997-09-05 | Tokyo Ohka Kogyo Co Ltd | Photosensitive pasty composition and formation of insulating patterned layer |
| US7493867B2 (en) | 2005-09-22 | 2009-02-24 | Juki Corporation | Sewing machine |
| JP2009132902A (en) * | 2007-11-08 | 2009-06-18 | Sumitomo Metal Mining Co Ltd | Surface-coated phosphor particle of strontium silicate, method for manufacturing the same and light emitting diode including the same |
| JP2013091801A (en) * | 2007-11-08 | 2013-05-16 | Sumitomo Metal Mining Co Ltd | Surface-coated strontium silicate phosphor particle, and light-emitting diode having the phosphor particle |
| JP2010144111A (en) * | 2008-12-22 | 2010-07-01 | Sumitomo Metal Mining Co Ltd | Sulfide phosphor particle having surface coating layer, and method of manufacturing the same |
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