JPH0290489A - Distributed el element - Google Patents

Distributed el element

Info

Publication number
JPH0290489A
JPH0290489A JP63241034A JP24103488A JPH0290489A JP H0290489 A JPH0290489 A JP H0290489A JP 63241034 A JP63241034 A JP 63241034A JP 24103488 A JP24103488 A JP 24103488A JP H0290489 A JPH0290489 A JP H0290489A
Authority
JP
Japan
Prior art keywords
layer
transparent electrode
binder
dielectric constant
transparent
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
Application number
JP63241034A
Other languages
Japanese (ja)
Inventor
Hideo Takahashi
英男 高橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP63241034A priority Critical patent/JPH0290489A/en
Publication of JPH0290489A publication Critical patent/JPH0290489A/en
Pending legal-status Critical Current

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  • Electroluminescent Light Sources (AREA)

Abstract

PURPOSE:To make it possible to prevent light-emitting face from being peeled even using a highly-permittive binder having little adhesiveness by performing an adhesion-strengthning treatment for its transparent electrode face. CONSTITUTION:A transparent electrode plate is employed which includes a transparent base 1 having a transparent conductive layer 2 formed thereon, and a channeled layer 3 of titan oxide barium having a film thickness of about 0.07mum is formed on the film 2. On the base 1 is formed a layer 4 of fluorescent material which includes cyanoethylcellulose highly-permittive binder and electroluminescent ZnS fluorescent bodies in a ratio of 1 to 3, and which has a film thickness of 45mum after drying. Next, a paste for an insulating reflecting layer is printed on the layer 4 to form an insulating reflecting layer 5, on which an Al back plate 6 is formed; after required moisture-proof sealing is carried out, a light-emitting element is obtained.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は分散型EL素子に係り、特に従来よりも輝度及
び発光効率の秀れた分散型EL素子に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a distributed EL device, and particularly to a distributed EL device that has superior brightness and luminous efficiency compared to conventional devices.

[従来の技術] 従来の分散型EL素子は、NEC技報Vo134゜No
8.p71に示されているように、また第2図に示した
ように、透明電極基板1とこれに相対する背面電極5と
の間に、電場発光性螢光体を高誘電率バインダに分散さ
せた螢光体層3及び高誘電率バインダとチタン酸バリウ
ム粉末よりなる絶縁反射層を有する構造であり、両型極
板間に交流電場を印加することにより発光する。その発
光強度は発光層中の螢光体粒子に加わる印加電場強度の
2〜3乗に比例して増大するので、輝度向上をはかるに
は螢光体粒子に加わる電場配分をできるだけ大にする必
要がある。それには発光層用バインダとしてできるだけ
高誘電率・低損失で、かつ絶縁耐圧の高いものが要求さ
れる。これに適切な材料として従来からシアノエチル化
セルローズが知られているが、本材料は接着性の面で劣
る欠点を有する。この対策として、従来からシアノエチ
ルセルローズにシアノエチル化セルローズの如き高誘電
率可塑剤を配合し電極基板との接着性を付与したものを
発光層用バインダとして用いる方法がとられてきた。
[Prior art] A conventional distributed EL element is described in NEC technical report Vo134°No.
8. As shown on page 71 and as shown in FIG. 2, an electroluminescent phosphor is dispersed in a high dielectric constant binder between the transparent electrode substrate 1 and the back electrode 5 opposite thereto. It has a structure including a phosphor layer 3 and an insulating reflective layer made of a high dielectric constant binder and barium titanate powder, and emits light by applying an alternating current electric field between both types of electrode plates. The emission intensity increases in proportion to the second to third power of the intensity of the electric field applied to the phosphor particles in the luminescent layer, so in order to improve brightness, it is necessary to increase the distribution of the electric field applied to the phosphor particles as much as possible. There is. To this end, a binder for the light-emitting layer is required to have as high a dielectric constant, as low a loss as possible, and as high as possible withstand voltage. Although cyanoethylated cellulose has been known as a suitable material for this purpose, this material has the disadvantage of poor adhesiveness. As a countermeasure against this problem, a method has conventionally been taken in which a high dielectric constant plasticizer such as cyanoethylated cellulose is blended with cyanoethyl cellulose to impart adhesiveness to the electrode substrate, and the material is used as a binder for the light emitting layer.

[発明が解決しようとする問題点] しかし、シアノエチル化セルローズのシアノエチル基置
換度を大きくして誘電率を高くしたものは前記対策をし
ても接着性が不足で、そのため発光層子作成工程中に、
発光層が透明電極面から部分的に斑点状剥離する欠点が
あった。
[Problems to be Solved by the Invention] However, cyanoethylated cellulose whose dielectric constant is increased by increasing the degree of cyanoethyl group substitution does not have sufficient adhesion even if the above measures are taken, and as a result, during the process of producing a light emitting layer. To,
There was a drawback that the light-emitting layer peeled off in spots from the surface of the transparent electrode.

本発明の目的は接着性の悪いシアノエチルセルローズ系
高誘電率バインダを用いても発光面剥離を防止する手段
を提供するにある。
An object of the present invention is to provide a means for preventing peeling of a light emitting surface even when a cyanoethyl cellulose-based high dielectric constant binder having poor adhesiveness is used.

[問題点を解決するための手段] 上記目的は、透明電極面に対する発光層の接着強度を増
大させるべく、透明電極面に接着力強化処理をすること
により達成される。
[Means for Solving the Problems] The above object is achieved by subjecting the transparent electrode surface to adhesive force strengthening treatment in order to increase the adhesive strength of the light emitting layer to the transparent electrode surface.

[作用] 透明電極面の接着力強化処理法として、従来からシラン
カップリング剤処理やSOG法等によるS i O,薄
層コーティング等が知られているが。
[Function] As a treatment method for strengthening the adhesive strength of a transparent electrode surface, silane coupling agent treatment, SiO thin layer coating by SOG method, etc. have been known.

これらの方法で形成した層は誘電率が低いという欠点が
ある。それで本発明に於いては、できるだけ誘電率の高
い無機系化合物、酸化物の薄層を形成することにした。
Layers formed by these methods have a drawback of low dielectric constant. Therefore, in the present invention, it was decided to form a thin layer of an inorganic compound or oxide having as high a dielectric constant as possible.

接着力強化を主目的とするので膜厚は0.05〜0.1
μmで十分であるが、さらに素子の電極間の絶縁耐圧を
向上させることを目的とする場合は0.5μm位の膜厚
に形成すると良い。
The main purpose is to strengthen the adhesive strength, so the film thickness is 0.05 to 0.1
Although .mu.m is sufficient, if the purpose is to further improve the dielectric strength between the electrodes of the element, it is preferable to form the film to a thickness of about 0.5 .mu.m.

上記無機系高誘電率物質の例としては、チタン酸バリウ
ム、チタン酸鉛、ジルコン酸鉛・バリウム及び酸化チタ
ン等があり、これらの溝層はRFスパッタリング法によ
り容易に形成できる。単に接着力強化を目的とする場合
は0.05〜0.1μmで十分であり、この高誘電率溝
層を形成した透明導電面は従来接着性が悪い理由で使用
を避けたシアノエチルセルローズ系発光層との接着性が
改善され、作成中に於ける発光層剥離問題が解消する。
Examples of the inorganic high dielectric constant materials include barium titanate, lead titanate, lead/barium zirconate, and titanium oxide, and these groove layers can be easily formed by RF sputtering. If the purpose is simply to strengthen the adhesive strength, 0.05 to 0.1 μm is sufficient, and the transparent conductive surface on which this high dielectric constant groove layer is formed is made of cyanoethyl cellulose-based luminescent material, which has traditionally been avoided due to its poor adhesive properties. The adhesion between the layers is improved and the problem of light-emitting layer peeling during fabrication is resolved.

[実施例] 以下、本発明の一実施例を第1図により説明する。透明
基板1上に透明導電層(ITO膜)2を形成した透明電
極板を使用し、約20%の酸素含有Arガス雰囲気中に
おけるRFスパッタリング法により、透明導電膜2上に
膜厚約0.07μmのチタン酸バリウム溝層3を形成し
た。この基板上にスクリーン印刷法によりシアノエチル
セルローズ系高誘電率バインダ1部(重量)、電場発光
性ZnS螢光体3部(重量)よりなる螢光体層4を乾燥
後の膜厚約45μmに形成した。シアノエチルセルロー
ズ系バインダはシアノエチルセルローズ1部(重量)に
シアノエチルサッカローズを4部(重量)配合したもの
であり、Nメチル−2ピロリドン等の溶剤で印刷適正粘
度のペーストにして使用した。引続き、スクリーン印刷
法により、該発光層4上に、シアノエチルセルローズ1
部重量、シアノエチルサッカローズを8部(重量)、チ
タン酸バリウム粉末45部(重量)及び適量の溶剤より
なる絶縁反射層用ペーストを印刷し、乾燥後の膜厚約2
0μmの絶縁性反射層5を形成した。発光層と絶縁反射
層の合計膜厚は約60μmである。次に該反射層5上に
真空蒸着法によりAQ背面電極6を形成した。上記の方
法で作成した素子に対し所定の防湿封止を施して発光素
子とした。
[Example] Hereinafter, an example of the present invention will be described with reference to FIG. Using a transparent electrode plate in which a transparent conductive layer (ITO film) 2 is formed on a transparent substrate 1, a film thickness of approximately 0.0 mm is formed on the transparent conductive film 2 by RF sputtering in an Ar gas atmosphere containing approximately 20% oxygen. A barium titanate groove layer 3 with a thickness of 0.07 μm was formed. A phosphor layer 4 consisting of 1 part (by weight) of a cyanoethyl cellulose-based high dielectric constant binder and 3 parts (by weight) of an electroluminescent ZnS phosphor is formed on this substrate by a screen printing method to a thickness of approximately 45 μm after drying. did. The cyanoethyl cellulose binder was a mixture of 1 part (by weight) of cyanoethyl cellulose and 4 parts (by weight) of cyanoethyl saccharose, and was used in the form of a paste having an appropriate viscosity for printing with a solvent such as N-methyl-2-pyrrolidone. Subsequently, cyanoethyl cellulose 1 was applied onto the light emitting layer 4 by screen printing.
8 parts (by weight) of cyanoethyl sucrose, 45 parts (by weight) of barium titanate powder, and an appropriate amount of solvent were printed, and the film thickness after drying was approximately 2.
An insulating reflective layer 5 having a thickness of 0 μm was formed. The total thickness of the light emitting layer and the insulating reflective layer is approximately 60 μm. Next, an AQ back electrode 6 was formed on the reflective layer 5 by vacuum evaporation. The device produced by the above method was subjected to predetermined moisture-proof sealing to produce a light-emitting device.

上記素子の発光層印刷後の乾燥及び反射層形成後の乾燥
過程及びAΩ蒸着や防湿封止の過程においても、発光層
剥離は発生せず、全面均質な発光面が得られた。その発
光強度は50Hz100Vで約20cd/rrFであり
400HzlOOVでは約150 cd/−であった。
Even in the drying process after printing the light emitting layer of the above device, the drying process after forming the reflective layer, and the process of AΩ vapor deposition and moisture-proof sealing, no peeling of the light emitting layer occurred, and a uniform light emitting surface was obtained over the entire surface. The emission intensity was about 20 cd/rrF at 50 Hz, 100 V, and about 150 cd/- at 400 Hz, lOOV.

上記は本発明の一実施例を述べたものであるが、透明基
板がガラス板の場合でもまたプラスチック板の場合でも
同様の効果が確認された。また上記実施例ではチタン酸
バリウムの0.07μm層形成の例であるが、チタン酸
鉛やジルコン酸鉛バリウム及び酸化チタン溝層を形成し
た場合も、シアノエチルセルローズ系発光層バインダに
対する接着力増大が認められた。本発明による処理をし
ない場合は発光層が斑点状に剥離することは云うまでも
ない。
Although the above describes one embodiment of the present invention, similar effects were confirmed whether the transparent substrate was a glass plate or a plastic plate. Furthermore, although the above embodiment is an example of forming a 0.07 μm layer of barium titanate, the adhesive strength to the cyanoethylcellulose-based light-emitting layer binder can also be increased when lead titanate, lead barium zirconate, and titanium oxide groove layers are formed. Admitted. Needless to say, if the treatment according to the present invention is not performed, the luminescent layer will peel off in spots.

[発明の効果] 本発明によれば、従来接着性が劣るために使用を避けて
きたシアノエチルセルローズ系バインダを発光層用とし
て使用が可能になり、輝度向上及び電極間絶縁耐圧向上
の効果があり、低価格で大面積化も容易な分散型EL素
子の実用化拡大に貢献する所大である。
[Effects of the Invention] According to the present invention, cyanoethylcellulose-based binders, which have traditionally been avoided due to their poor adhesive properties, can now be used for the light-emitting layer, which has the effect of improving brightness and interelectrode dielectric strength. This is a major contribution to the expansion of practical use of distributed EL devices, which are low-cost and easy to increase in area.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例を説明するEL素子の横断面
図、第2図は従来のEL素子の横断面図である。 符号の説明 1・・・透明基板、2・・・透明導電層、3・・・高誘
電率無機化合物層、4・・・螢光体層、5・・・絶縁反
射層、6・・・背面電極。 1、−g lf]を脂 第 2図
FIG. 1 is a cross-sectional view of an EL element illustrating an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional EL element. Explanation of symbols 1... Transparent substrate, 2... Transparent conductive layer, 3... High dielectric constant inorganic compound layer, 4... Fluorescent layer, 5... Insulating reflective layer, 6... Back electrode. 1, -g lf] Figure 2

Claims (1)

【特許請求の範囲】[Claims]  1.相対する一対の透明電極基板と背面電極との間に
高誘電率バインダと電場発光性螢光体からなる発光層及
び絶縁反射層を有する構造の分散型EL素子において、
該素子の透明電極基板として、透明電極面上に膜厚0.
5μm以下の高誘電率・無機系化合物または酸化物の薄
膜を形成したものを用いることを特徴とする分散型EL
素子。
1. In a dispersion type EL element having a structure having a light emitting layer and an insulating reflective layer made of a high dielectric constant binder and an electroluminescent phosphor between a pair of opposing transparent electrode substrates and a back electrode,
As a transparent electrode substrate of the device, a film with a thickness of 0.5 mm is formed on the transparent electrode surface.
Dispersed EL characterized by using a thin film of a high dielectric constant inorganic compound or oxide of 5 μm or less
element.
JP63241034A 1988-09-28 1988-09-28 Distributed el element Pending JPH0290489A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63241034A JPH0290489A (en) 1988-09-28 1988-09-28 Distributed el element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63241034A JPH0290489A (en) 1988-09-28 1988-09-28 Distributed el element

Publications (1)

Publication Number Publication Date
JPH0290489A true JPH0290489A (en) 1990-03-29

Family

ID=17068340

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63241034A Pending JPH0290489A (en) 1988-09-28 1988-09-28 Distributed el element

Country Status (1)

Country Link
JP (1) JPH0290489A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05326149A (en) * 1992-05-20 1993-12-10 Fukuvi Chem Ind Co Ltd Dispersed electroluminescence
JPH06223973A (en) * 1992-09-22 1994-08-12 Stanley Electric Co Ltd Dispersion type el element
EP0821545A2 (en) * 1996-07-26 1998-01-28 Seung-Young Kim Luminous display and a manufacturing method thereof
JP2008019970A (en) * 2006-07-12 2008-01-31 Suiken:Kk Telescopic universal joint

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05326149A (en) * 1992-05-20 1993-12-10 Fukuvi Chem Ind Co Ltd Dispersed electroluminescence
JPH06223973A (en) * 1992-09-22 1994-08-12 Stanley Electric Co Ltd Dispersion type el element
EP0821545A2 (en) * 1996-07-26 1998-01-28 Seung-Young Kim Luminous display and a manufacturing method thereof
EP0821545A3 (en) * 1996-07-26 1998-08-05 Seung-Young Kim Luminous display and a manufacturing method thereof
JP2008019970A (en) * 2006-07-12 2008-01-31 Suiken:Kk Telescopic universal joint

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