JPH01264196A - Dispersion type electroluminescent element - Google Patents
Dispersion type electroluminescent elementInfo
- Publication number
- JPH01264196A JPH01264196A JP63092551A JP9255188A JPH01264196A JP H01264196 A JPH01264196 A JP H01264196A JP 63092551 A JP63092551 A JP 63092551A JP 9255188 A JP9255188 A JP 9255188A JP H01264196 A JPH01264196 A JP H01264196A
- Authority
- JP
- Japan
- Prior art keywords
- insulation layer
- insulating layer
- liquid
- light emitting
- emitting layer
- 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
- 239000006185 dispersion Substances 0.000 title claims description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 150000004703 alkoxides Chemical class 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 3
- 230000007062 hydrolysis Effects 0.000 abstract description 3
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 3
- 239000011368 organic material Substances 0.000 abstract description 3
- 239000000758 substrate 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
- 229910052788 barium Inorganic materials 0.000 abstract description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003822 epoxy resin Substances 0.000 abstract description 2
- 229920000647 polyepoxide Polymers 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 abstract 5
- 239000007788 liquid Substances 0.000 abstract 5
- 230000006698 induction Effects 0.000 abstract 3
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 abstract 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 10
- 229910002113 barium titanate Inorganic materials 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 239000004416 thermosoftening plastic Substances 0.000 description 4
- 239000010949 copper Substances 0.000 description 3
- 239000011882 ultra-fine particle Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 244000171726 Scotch broom Species 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002305 electric material Substances 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Electroluminescent Light Sources (AREA)
Abstract
Description
【発明の詳細な説明】
産ｊＬｋｌ千団Ｌ１万一
本発明は分散型ＥＬ素子に関し、特にその絶縁層の構成
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a distributed EL device, and particularly to the structure of an insulating layer thereof.
従来（２）１断
従来の分散型ＥＬ素子は、第４図に示すように、背面電
極ｌとなるＡ１箔やＣｕ箔などの上に、シアノエチルロ
ースなどの熱可塑性バインダー中に高き電率を有するチ
タン酸バリウム等の粉末を分散させて成る絶縁層２を形
成し、さらに、銅で付活した硫化亜鉛系の蛍光体（Ｚｎ
Ｓ：Ｃｕ）を同様の熱可塑性バインダー中に分散させて
成る発光層３を形成し、発光層３上に透明導電フィルム
４を熱圧着し、必要により、更にナイロン８６等の吸湿
フィルム５，６を介在して、外界からの水分の侵入を防
ぐために、透水性の少ない三弗化塩化エチレン等よりな
る外皮フィルム７．８で、被覆した構成となっていた。Conventional (2) 1-section Conventional dispersion type EL elements, as shown in Fig. 4, have a high electrical conductivity in a thermoplastic binder such as cyanoethylulose on top of A1 foil, Cu foil, etc., which becomes the back electrode l. The insulating layer 2 is formed by dispersing powder of barium titanate, etc., and further, zinc sulfide-based phosphor (Zn) activated with copper is formed.
A light-emitting layer 3 is formed by dispersing S:Cu) in a similar thermoplastic binder, a transparent conductive film 4 is thermocompression-bonded on the light-emitting layer 3, and if necessary, moisture-absorbing films 5, 6 such as nylon 86 are added. In order to prevent the intrusion of moisture from the outside world, the structure was such that it was covered with an outer skin film 7.8 made of trifluorochloroethylene, etc., which has low water permeability.
発朋（’ ” 、１
前述のように、一般に分散型ＥＬ素子では、発光層３に
かかる電圧を上げるため、絶縁層２にチタン酸バリウム
等の為電体を用いている。このチタン酸バリウム２ａは
焼成、粉砕して作られており粒径ｄ、が大きいものが用
いられている。そのため絶縁層２として形成した場合、
粒子の充填性が悪く粒子間に多くの空隙を生じる。この
粒子間の空隙を埋めしかも、背面電極１及び発光層３と
接合するため、シアンエチルセルロースなどの熱可塑性
バインダー２ｂと混合して誘電率を上げている。しかし
、チタン酸バリウム２ａの比誘電率２９００に比べ、熱
可塑性バインダー２ｂの比誘電率は１０〜２０程度と小
さいためにその効果は少ない。さらに絶縁層２の厚さｔ
ｌはチタン酸バリウム２ａの粒径４０以上にしか形成で
きないので、薄膜化は制限される（第５図）。そこで絶
縁層２の厚さを薄くすることによる絶縁層における電圧
降下も少なくできない。As mentioned above, generally in distributed EL elements, an electric material such as barium titanate is used for the insulating layer 2 in order to increase the voltage applied to the light emitting layer 3. 2a is made by firing and pulverizing, and the particle size d is large.Therefore, when formed as the insulating layer 2,
Particle filling properties are poor and many voids occur between particles. In order to fill the gaps between the particles and bond them to the back electrode 1 and the light emitting layer 3, the particles are mixed with a thermoplastic binder 2b such as cyan ethyl cellulose to increase the dielectric constant. However, compared to the dielectric constant of barium titanate 2a, which is 2900, the dielectric constant of the thermoplastic binder 2b is as small as about 10 to 20, so the effect is small. Furthermore, the thickness t of the insulating layer 2
Since l can only be formed to have a grain size of barium titanate 2a of 40 or more, thinning of the film is limited (FIG. 5). Therefore, by reducing the thickness of the insulating layer 2, the voltage drop in the insulating layer cannot be reduced.
−゛ ２の
本発明は高誘電率の絶縁層を有する分散型ＥＬ素子を提
供することを目的としたものである。絶縁層は金属アル
コキシドの加水分解液と高誘電率の有機物質との混合液
を塗布及び乾燥したものであり、金属アルコキシド液が
超微粒子で形成され、結晶性を示しているチタン酸バリ
ウムであることを特徴とする分散型ＥＬ素子により、上
記目的を達成するようにしたものである。-2 The object of the present invention is to provide a distributed EL element having an insulating layer with a high dielectric constant. The insulating layer is made by applying and drying a mixed solution of a metal alkoxide hydrolyzate and a high dielectric constant organic substance, and the metal alkoxide solution is formed of ultrafine particles and is barium titanate that exhibits crystallinity. The above object is achieved by a distributed EL element characterized by the following.
１且
チタン酸バリウムの微粒子化による充填性の向上により
、絶縁層の比誘電率が上がり、緻密で薄い絶縁層を実現
でき、それにより絶縁層における電圧降下を少な（シ、
低電圧駆動及び高輝度の分散型ＥＬ素子を提供する。1. Improving the filling property by making barium titanate into fine particles increases the dielectric constant of the insulating layer, making it possible to realize a dense and thin insulating layer, thereby reducing the voltage drop in the insulating layer.
A distributed EL element with low voltage drive and high brightness is provided.
災直叶
以下に本発明について実施例を示して説明するが、本発
明はこれによりなんら限定されるものではない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments, but the present invention is not limited thereto in any way.
第１図に示すように、ガラス基板１１上にＩ。As shown in FIG. 1, I is placed on a glass substrate 11.
Ｔ、Ｏによる透明電極１２を形成し、その上にシアノエ
チルセルロース中にＺｎＳ ： Ｃｕ等の蛍光体を分散
させた発光層１３を形成しておく。次に実験室規模のも
のにおいてＢａ：Ｔｉ比が１：１になるようにチタンテ
トライソプロポキシド；Ｔｉ （Ｏ−１Ｃ５Ｈ７）、＋
１４２ｇとバリウムジイソブロシド； Ｂ ａ （０
−１Ｃ３鳴）ｚ １２８ ｇをイソプロピルアルコー
ル５１に混合し、撹拌しながら４時間の還流を行う。こ
の金属アルコキシド溶液に水１２７１をイソプロピルア
ルコールで希釈したものを餘々に加え、撹拌しながらさ
らに４時間の還流を行い金属アルコキシドの加水分解液
とする。A transparent electrode 12 made of T and O is formed, and a light-emitting layer 13 made of cyanoethylcellulose dispersed with a phosphor such as ZnS:Cu is formed thereon. Next, in a laboratory scale product, titanium tetraisopropoxide; Ti (O-1C5H7), +
142g and barium diisobroside; B a (0
128 g of 1C3 z is mixed with 51 g of isopropyl alcohol and refluxed for 4 hours with stirring. Water 1271 diluted with isopropyl alcohol is added to this metal alkoxide solution in large amounts, and the mixture is further refluxed for 4 hours while stirring to obtain a metal alkoxide hydrolysis solution.
このようにして得られたチタン酸バリウムは５０〜５０
０Ａ程度の超微粒子である。この加水分解液を濃縮し、
有機物質としてシアンエチルセルロースを添加後、その
溶液を発光層１３上に塗布し乾燥させることにより絶縁
層１４を形成し、さらにその上に有機金属ペーストを塗
布して背面電極１５を形成し、最後にその上にエポキシ
樹脂等による保護膜１６を形成し、分散型ＥＬ素子を作
成した。このようにして得られた本実施例における分散
型ＥＬ素子の輝度−電圧特性を一１定した。また、比較
例として、平均粒径５μｍのチタン酸バリウムを用いた
場合の分散型ＥＬ素子についても同様に測定し、これら
の結果を第３図に示した。The barium titanate obtained in this way has a concentration of 50 to 50
These are ultrafine particles of about 0A. Concentrate this hydrolyzate,
After adding cyanethyl cellulose as an organic substance, the solution is applied onto the light emitting layer 13 and dried to form an insulating layer 14, and an organic metal paste is further applied on top of this to form a back electrode 15, and finally, A protective film 16 made of epoxy resin or the like was formed thereon to produce a distributed EL element. The luminance-voltage characteristics of the dispersion type EL element in this example thus obtained were kept constant. Further, as a comparative example, a dispersion type EL element using barium titanate having an average particle size of 5 μm was similarly measured, and the results are shown in FIG.
なお、比誘電率の効果を確認するため、絶縁層２゜１４
と発光層３，１３の厚さはそれぞれ４５μｍ１３０μｍ
と同じにした。本実施例において絶縁層１４の比誘電率
が大きいので、発光層に分配される電圧が大きくなり、
印加電圧２００Ｖにおいて、約２０蛯の輝度が向上した
。さらにこの分散型ＥＬ素子における絶縁層１４はチタ
ン酸バリウム１４ａの粒子径ｄユが前述のように５０〜
５００Ａ程度との超微粒子であるため、第２図に示すよ
うに粒子間の隙間が小さく、絶縁層の厚さｔｌも２μｍ
程度と、従来に比べ著しく小さ（でき、発光層１３と絶
縁層１４にかかる電圧のうち発光層１３に分配される電
圧が従来に比し、約３０％太き（なった。In addition, in order to confirm the effect of relative permittivity, an insulating layer of 2°14
The thickness of the light emitting layers 3 and 13 is 45 μm and 130 μm, respectively.
I made it the same as In this example, since the dielectric constant of the insulating layer 14 is large, the voltage distributed to the light emitting layer becomes large.
At an applied voltage of 200 V, the brightness improved by about 20 degrees. Further, in the insulating layer 14 in this dispersion type EL element, the particle diameter d of the barium titanate 14a is 50 to 50, as described above.
Because they are ultrafine particles with a diameter of about 500A, the gaps between particles are small as shown in Figure 2, and the thickness tl of the insulating layer is also 2μm.
The voltage distributed to the light-emitting layer 13 out of the voltage applied to the light-emitting layer 13 and the insulating layer 14 was about 30% larger than that in the past.
髪匪些熱１
本発明によれば、分散型ＥＬ素子における絶縁層が高調
電体であり、さらに薄膜化することにより、低電圧によ
る駆動、輝度の向上が可能となる。According to the present invention, the insulating layer in the distributed EL element is a high voltage adjustment material, and by making the film thinner, it becomes possible to drive with a low voltage and improve brightness.
第１図は本発明に係わる分散型ＥＬ素子の実施例の断面
図、第２図はその絶縁層の拡大断面図、第３図は本発明
における実施例の分散型ＥＬ素子および従来の分散型Ｅ
Ｌ素子の輝度−電圧特性図を示す。第４図は従来の分散
型ＥＬ素子の断面図、第５図はその絶縁層の拡大断面図
である。
１１・・・ガラス基板、１２・・・透明電極、１３・・
・発光層、１４・・・絶縁層、１４ａ・・・チタン酸バ
リウム粒子、
１４ｂ・・・０機物質（バインダー）、１５・・・背面
電極。
笛 １ｐ１
箒 ２ ｍｕ
ト１’／”４７Ｌ（ｒｒｎｓっ
Ｒ’ｉ ３ ｒ’、） 輝光ｔ２月−７似、昂 ４
図
箪 ５ｔ）】FIG. 1 is a sectional view of an embodiment of a distributed EL device according to the present invention, FIG. 2 is an enlarged sectional view of an insulating layer thereof, and FIG. 3 is a sectional view of a distributed EL device according to an embodiment of the present invention and a conventional distributed type E
A brightness-voltage characteristic diagram of an L element is shown. FIG. 4 is a sectional view of a conventional distributed EL element, and FIG. 5 is an enlarged sectional view of its insulating layer. 11...Glass substrate, 12...Transparent electrode, 13...
- Light emitting layer, 14... Insulating layer, 14a... Barium titanate particles, 14b... Zero organic material (binder), 15... Back electrode. Flute 1p1 Broom 2 mu To1'/"47L (rrns R'i 3 r',) Teruko tFebruary-7 similar, Ko 4
Illustration 5t)]
Claims (1)
光層と絶縁層を形成して成る分散型ＥＬ素子において、 前記絶縁層が金属アルコキシドの加水分解液と高誘電率
の有機物質との混合液を塗布及び乾燥したものであるこ
とを特徴とする分散型ＥＬ素子。[Claims] A distributed EL device comprising a light emitting layer and an insulating layer formed between a pair of electrodes, at least one of which is a transparent electrode, wherein the insulating layer is made of a metal alkoxide hydrolyzate and a high dielectric constant material. A dispersion type EL device characterized in that it is obtained by coating and drying a mixed solution with an organic substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63092551A JPH01264196A (en) | 1988-04-13 | 1988-04-13 | Dispersion type electroluminescent element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63092551A JPH01264196A (en) | 1988-04-13 | 1988-04-13 | Dispersion type electroluminescent element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01264196A true JPH01264196A (en) | 1989-10-20 |
Family
ID=14057536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63092551A Pending JPH01264196A (en) | 1988-04-13 | 1988-04-13 | Dispersion type electroluminescent element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01264196A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06223973A (en) * | 1992-09-22 | 1994-08-12 | Stanley Electric Co Ltd | Dispersion type el element |
| JP2005158491A (en) * | 2003-11-26 | 2005-06-16 | Fuji Photo Film Co Ltd | Distributed electroluminescence element |
-
1988
- 1988-04-13 JP JP63092551A patent/JPH01264196A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06223973A (en) * | 1992-09-22 | 1994-08-12 | Stanley Electric Co Ltd | Dispersion type el element |
| JP2005158491A (en) * | 2003-11-26 | 2005-06-16 | Fuji Photo Film Co Ltd | Distributed electroluminescence element |
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