JPH01253193A - Electroluminescence element - Google Patents
Electroluminescence elementInfo
- Publication number
- JPH01253193A JPH01253193A JP63080461A JP8046188A JPH01253193A JP H01253193 A JPH01253193 A JP H01253193A JP 63080461 A JP63080461 A JP 63080461A JP 8046188 A JP8046188 A JP 8046188A JP H01253193 A JPH01253193 A JP H01253193A
- Authority
- JP
- Japan
- Prior art keywords
- back electrode
- conductive
- powders
- electroluminescence element
- hardened
- 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
- 238000005401 electroluminescence Methods 0.000 title abstract 4
- 239000000843 powder Substances 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 abstract description 5
- 229920005989 resin Polymers 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 239000003960 organic solvent Substances 0.000 abstract description 3
- 238000007650 screen-printing Methods 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 6
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000007738 vacuum evaporation Methods 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910003437 indium oxide Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000001771 vacuum deposition Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010409 thin film Substances 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、エレクトロルミネッセンス素子（以下ＥＬ素
子と略す）に関し、特に大面積に均質な表示特性を持ち
、安定性の優れた直流印加型ＥＬ素子（ＤＣＥＬ素子と
略す）に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electroluminescent device (hereinafter abbreviated as an EL device), and in particular to a direct current application type EL device that has uniform display characteristics over a large area and has excellent stability. The present invention relates to an element (abbreviated as DCEL element).
コンピュータ端末のフラットデイスプレィとして、種々
の構造のＥＬ素子が盛に研究されている。EL elements of various structures are being actively researched as flat displays for computer terminals.
従来このようなＥＬ素子の一種に第１図に示すようなり
ＣＥＬ素子がある。このＤＣＥＬ素子はガラス基板ｌ上
にスズを添加した酸化インジウム（ＩＴＯ）の透明電極
２が形成され、その上にＺｎＳ ： ＭｎあるいはＺｎ
Ｓ：ＴｂなどのＥＬ発光層３が真空蒸着法、またはスパ
ッタリング法などで形成され、さらにその上にＣｕＯ＋
Ｍｎ０ｉ Ｉ Ｔｂ４０ｔ ＋ ＥｕｚＯｓ ＋Ｐｒ
（ｈなどの比較的高抵抗率物質の微粉末をバインダーで
固めた電流制御の働きをする抵抗層４がスプレー法で形
成され、最後にＡｌの背面電極５が真空蒸着法で形成さ
れた素子構造である。（例えば英国特許２１７６３４０
八）。One type of conventional EL element is a CEL element as shown in FIG. In this DCEL element, a transparent electrode 2 made of indium oxide (ITO) doped with tin is formed on a glass substrate 1, and a transparent electrode 2 made of indium oxide (ITO) doped with tin is formed on the transparent electrode 2.
An EL light emitting layer 3 made of S:Tb or the like is formed by a vacuum evaporation method or a sputtering method, and further CuO+ is formed thereon.
Mn0i I Tb40t + EuzOs +Pr
(The resistive layer 4, which functions as a current controller, is made by hardening fine powder of a relatively high resistivity substance such as H with a binder, and is formed by a spray method.Finally, the back electrode 5 of Al is formed by a vacuum evaporation method.) (For example, British patent 2176340
Eight).
しかしながら、上記した従来のＤＣＥＬ素子に於いては
、真空蒸着法により形成されたＡ１薄膜を背面電極に用
いるため、ＥＬ発光動作時にＡ２電極の陽極酸化が局所
的に生じることにより電流集中を生じ、局所的に高温加
熱されて破壊を生じる問題があった。However, in the conventional DCEL element described above, since the A1 thin film formed by vacuum evaporation is used as the back electrode, anodic oxidation of the A2 electrode occurs locally during EL light emission, causing current concentration. There was a problem that localized high temperature heating caused destruction.
本発明は、上記問題点を解決するためになされたもので
あって、透明な絶縁性基板上に、透明電極、発光層、抵
抗層および背面電極を順次積層したＥＬ素子において、
背面電極に導電性粉末を主成分とした導電性ペーストを
硬化固着させた導電層を用いる。The present invention has been made to solve the above problems, and is an EL element in which a transparent electrode, a light emitting layer, a resistive layer and a back electrode are sequentially laminated on a transparent insulating substrate.
A conductive layer made of hardened and fixed conductive paste containing conductive powder as a main component is used for the back electrode.
前記導電性粉末としては、酸化が起こりにくいＡｕ＋
ｐｔ、 Ａｇなどの貴金属、ＲｕＯ２、５ｎ０Ｈなどの
導電性酸化物あるいはカーボンの粉末が使用できるが、
中でもカーボン粉末が化学的に非常に安定であり、かつ
低抵抗体であるのでＥＬ素子の背面電極材料として最も
好ましい。The conductive powder is Au+, which is difficult to oxidize.
Noble metals such as PT and Ag, conductive oxides such as RuO2 and 5n0H, or carbon powder can be used.
Among them, carbon powder is the most preferred material for the back electrode of an EL element because it is chemically very stable and has low resistance.
上記導電性粉末の形状としては、導電性ペーストとして
取り扱える範囲の大きさであれば任意の大きさのものが
使用できる。内でも０．０２〜０．５μｍの微粒の粉末
が高い導電率を実現できるので好ましい。The conductive powder may have any size as long as it can be handled as a conductive paste. Among these, fine powder of 0.02 to 0.5 μm is preferred because it can achieve high conductivity.
父上記導電性粉末を含む導電性ペーストとしては、例え
ば導電性粉末、樹脂、有機溶媒等を混合した物等が例示
できる。又これに限らず塗布操作によって導電層を形成
できるものであればかまわない。Examples of the conductive paste containing the conductive powder described above include a mixture of conductive powder, resin, organic solvent, and the like. Moreover, the material is not limited to this, and any material that can form a conductive layer by a coating operation may be used.
上記導電性ペーストは、硬化固着されて電極として使用
されるが、例えば前記導電性粉末、樹脂、有機溶媒等の
混合物は乾燥することによって硬化・固着できる。The conductive paste is used as an electrode after being hardened and fixed. For example, a mixture of the conductive powder, resin, organic solvent, etc. can be hardened and fixed by drying.
本発明によれば、背面電極に導電性粉末、好ましくはカ
ーボン粉末を主成分とした導電性ペーストを硬化固着さ
せた導電層を用いているため、ＥＬ発光動作時に背面電
極が化学変化して導電性が損なわれることがなくなり、
素子の破壊を防止することができる。According to the present invention, since the back electrode uses a conductive layer in which a conductive paste mainly composed of conductive powder, preferably carbon powder, is hardened and fixed, the back electrode undergoes chemical change during EL light emission operation and becomes conductive. Your sexuality will no longer be lost,
Destruction of the element can be prevented.
特に、カーボン粉末を用いた背面電極はＥＬ素子の表示
面側から入射した外部光を該背面電極が吸収して反射光
を減すので、高いコントラストの表示が得られる効果が
ある。In particular, a back electrode using carbon powder has the effect of providing high contrast display because the back electrode absorbs external light incident from the display surface side of the EL element and reduces reflected light.
以下、本発明の実施例について説明する。第１図は本発
明に係るＥＬ素子の基本構造を示した断面図である。Examples of the present invention will be described below. FIG. 1 is a sectional view showing the basic structure of an EL element according to the present invention.
ガラス基板（１）上に、透明電極（２）をスパッタリン
グ法により約４００ｎｍの厚さのＩＴＯ膜で形成し、そ
の後ホトリソ−エツチング法により所定の電極形状にパ
ターニングした。A transparent electrode (2) was formed as an ITO film with a thickness of about 400 nm on a glass substrate (1) by sputtering, and then patterned into a predetermined electrode shape by photolithography.
次に、発光層（３）を真空蒸着法により、約１μｍの厚
さのＭｎがドープされたＺｎＳ膜で形成した。Next, a light emitting layer (3) was formed of a Mn-doped ZnS film with a thickness of about 1 μm by vacuum evaporation.
次に： ＭｎＯ□の粉末がバインダー樹脂とシンナーの
混合液に分散された塗料をスプレー法で塗布し、続いて
乾燥して抵抗率が約ｌＸＩＯ３Ω■で膜厚が約２０μｍ
の抵抗層をべた膜で形成した。Next: A paint in which MnO□ powder is dispersed in a mixture of binder resin and thinner is applied by spraying, and then dried to form a film with a resistivity of about 1XIO3Ω■ and a film thickness of about 20 μm.
The resistance layer was formed from a solid film.
次に、カーボンの粉末がバインダー樹脂とシンナーの混
合液に分散されたペースト（市販されているカーボンペ
ーストを使用）をスクリーン印刷法により背面電極の形
状に印刷し、続いて乾燥硬化して、抵抗率が約ｌＸｌ０
−”Ωｃｍで膜厚が約３０μｍの背面電極（５）を形成
した。Next, a paste in which carbon powder is dispersed in a mixture of binder resin and thinner (a commercially available carbon paste is used) is printed in the shape of the back electrode using a screen printing method, and then dried and hardened to form a resistor. The rate is about lXl0
A back electrode (5) having a film thickness of about 30 μm was formed with -”Ωcm.
次に、前記べた膜状の抵抗層をダイヤモンド針により、
前記背面電極（５）の溝部に当る部分をスクライブし、
背面電極と相似のパターン形状の抵抗層（４）を形成し
た。Next, the solid film-like resistance layer is removed using a diamond needle.
Scribing the part corresponding to the groove of the back electrode (5),
A resistive layer (4) having a pattern similar to that of the back electrode was formed.
本実施例におけるＥＬ素子は、従来の背面電極ＡＮを用
いたＥＬ素子が約１０００時間の発光動作で発光面積の
約２０％が背面電極の陽極酸化により局部的過電流が流
れるようになって破壊したのに対して、５％以下の破壊
が見られた程度で大幅に素子破壊が改善された。In the EL element in this example, the EL element using the conventional back electrode AN was destroyed after about 1000 hours of light emitting operation due to local overcurrent flowing due to anodic oxidation of the back electrode. On the other hand, element destruction was significantly improved, with only 5% or less destruction observed.
本発明によれば、背面電極に導電性粉末、好ましくはカ
ーボン粉末を主成分とした導電性ペーストを硬化固着さ
せた導電層を用いているので、長寿命で安定な表示特性
を持ったＥＬ素子が得られる。According to the present invention, since a conductive layer in which a conductive paste mainly composed of conductive powder, preferably carbon powder, is hardened and fixed is used for the back electrode, the EL element has a long life and stable display characteristics. is obtained.
また、本発明によれば、背面電極をスクリーン印刷性等
安価の方法で形成できるので従来の真空蒸着法による背
面電極材料法に較べて製造設備費が安く生産性が高いの
で安価なりＣＥＬ素子を提供することが出来る。In addition, according to the present invention, the back electrode can be formed by an inexpensive method such as screen printing, so compared to the conventional back electrode material method using vacuum evaporation, manufacturing equipment costs are lower and productivity is higher, which makes it possible to make CEL elements cheaper. can be provided.
第１図は本発明による直流印加型ＥＬ素子の断面図であ
る。
１ニガラス基板、２：透明電極、３：ＥＬ発光層、４：
抵抗層、５：背面電極。
第１図FIG. 1 is a sectional view of a direct current application type EL element according to the present invention. 1 glass substrate, 2: transparent electrode, 3: EL light emitting layer, 4:
Resistance layer, 5: back electrode. Figure 1
Claims (2)
層および背面電極を順次積層したエレクトロルミネッセ
ンス素子において、該背面電極が導電性粉末を主成分と
した導電性ペーストを硬化固着させた導電層であること
を特徴とするエレクトロルミネッセンス素子。(1) In an electroluminescent element in which a transparent electrode, a light-emitting layer, a resistive layer, and a back electrode are sequentially laminated on a transparent insulating substrate, the back electrode is hardened and fixed with a conductive paste containing conductive powder as a main component. An electroluminescent element characterized by being a conductive layer.
記載のエレクトロルミネッセンス素子。(2) Claim 1, wherein the conductive powder is carbon powder.
The electroluminescent device described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63080461A JPH01253193A (en) | 1988-04-01 | 1988-04-01 | Electroluminescence element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63080461A JPH01253193A (en) | 1988-04-01 | 1988-04-01 | Electroluminescence element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01253193A true JPH01253193A (en) | 1989-10-09 |
Family
ID=13718899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63080461A Pending JPH01253193A (en) | 1988-04-01 | 1988-04-01 | Electroluminescence element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01253193A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0438699U (en) * | 1990-07-30 | 1992-03-31 | ||
| JPH0888088A (en) * | 1994-09-16 | 1996-04-02 | Nec Kansai Ltd | El element for display and its manufacture |
| EP0853334A4 (en) * | 1996-06-19 | 2001-07-04 | Matsushita Electric Ind Co Ltd | Optoelectronic material, device using the same, and method for manufacturing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62195895A (en) * | 1986-02-21 | 1987-08-28 | アルプス電気株式会社 | Electroluminescence device |
-
1988
- 1988-04-01 JP JP63080461A patent/JPH01253193A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62195895A (en) * | 1986-02-21 | 1987-08-28 | アルプス電気株式会社 | Electroluminescence device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0438699U (en) * | 1990-07-30 | 1992-03-31 | ||
| JPH0888088A (en) * | 1994-09-16 | 1996-04-02 | Nec Kansai Ltd | El element for display and its manufacture |
| EP0853334A4 (en) * | 1996-06-19 | 2001-07-04 | Matsushita Electric Ind Co Ltd | Optoelectronic material, device using the same, and method for manufacturing the same |
| US6730934B2 (en) | 1996-06-19 | 2004-05-04 | Matsushita Electric Industrial Co., Ltd. | Optoelectronic material, device using the same and method for manufacturing optoelectronic material |
| US6838743B2 (en) | 1996-06-19 | 2005-01-04 | Matsushita Electric Industrial Co., Ltd. | Optoelectronic material, device using the same and method for manufacturing optoelectronic material |
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