JPH06223973A - Dispersion type el element - Google Patents
Dispersion type el elementInfo
- Publication number
- JPH06223973A JPH06223973A JP42A JP25298192A JPH06223973A JP H06223973 A JPH06223973 A JP H06223973A JP 42 A JP42 A JP 42A JP 25298192 A JP25298192 A JP 25298192A JP H06223973 A JPH06223973 A JP H06223973A
- Authority
- JP
- Japan
- Prior art keywords
- dispersion type
- powder
- insulating layer
- chlorine
- life
- 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、蛍光体をバインダ
（ｂｉｎｄｅｒ）中に分散させた発光体層を透明電極と
背面電極の間に積層した分散型ＥＬ素子、特に発光体層
の背面に絶縁層を有した分散型ＥＬ素子に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispersion type EL device in which a phosphor layer in which a phosphor is dispersed in a binder is laminated between a transparent electrode and a back electrode, and in particular, the back surface of the phosphor layer is insulated. The present invention relates to a dispersion type EL device having a layer.
【０００２】[0002]
【従来の技術】分散型ＥＬ素子は、蛍光体をバインダ中
に分散させて、スクリーン印刷法等により数１０μｍの
厚さに形成した発光体層が用いられており、この発光体
層を透明電極と背面電極の間に積層した構造を有してい
る。また、実用上発光体層の背面には白色反射層となる
絶縁層が設けられている。2. Description of the Related Art Dispersion type EL devices use a light emitting layer formed by dispersing a phosphor in a binder and forming it to a thickness of several tens of μm by a screen printing method. This light emitting layer is used as a transparent electrode. It has a structure laminated between the back electrode and the back electrode. In addition, an insulating layer serving as a white reflective layer is provided on the back surface of the light emitting layer for practical use.
【０００３】このように構成されたＥＬ素子は、ＬＣＤ
等のバックライトとして期待されており、また面状の光
源として広く利用されている。The EL element thus constructed is an LCD
It is expected to be used as a backlight for light sources, etc., and is widely used as a planar light source.
【０００４】図５はこの従来の分散型ＥＬ素子のライフ
テスト（寿命測定）の結果を示したものである。ここで
は１００Ｖ・４００Ｈｚの交流駆動を行った場合を示
し、横軸は駆動時間ｈｒ（単位千時間）、縦軸は輝度維
持率％をそれぞれ表している。この輝度維持率−駆動時
間のグラフからも示されるように、輝度の半減する半減
時間は１０００ｈｒ以下となっている。FIG. 5 shows the result of a life test (lifetime measurement) of this conventional dispersion type EL device. Here, the case where AC driving of 100 V / 400 Hz is performed is shown, the horizontal axis represents the driving time hr (unit: 1,000 hours), and the vertical axis represents the luminance maintenance ratio%. As shown in the graph of the luminance maintenance ratio-driving time, the half-life time of the luminance being halved is 1000 hr or less.
【０００５】[0005]
【発明が解決しようとする課題】上記のような従来の分
散型ＥＬ素子にあっては、ＬＤＣ等のバックライトとし
ても期待されているが、輝度の半減時間が１０００ｈｒ
以下で、寿命が短く、このため使用範囲が限定されてし
まうという問題点があった。The conventional dispersion type EL element as described above is expected as a backlight for LDC and the like, but the half-life time of luminance is 1000 hr.
In the following, there is a problem that the life is short and thus the range of use is limited.
【０００６】この発明は、上記のような問題点に着目し
てなされたもので、寿命が長く、使用範囲の広い分散型
ＥＬ素子を提供することを目的としている。The present invention has been made in view of the above problems, and an object thereof is to provide a dispersion type EL element having a long life and a wide range of use.
【０００７】[0007]
【課題を解決するための手段】この発明の分散型ＥＬ素
子は、発光体層と背面電極との間にチタン酸バリウムの
粉末を分散した絶縁層を有し、そのチタン酸バリウムの
粉末が陰イオンを含有しているものである。The dispersion type EL device of the present invention has an insulating layer in which powder of barium titanate is dispersed between a light emitting layer and a back electrode, and the powder of barium titanate is negative. It contains ions.
【０００８】また、上記チタン酸バリウムの粉末が塩素
を１０〜１００００ｐｐｍ含有しているものである。The barium titanate powder contains 10 to 10,000 ppm of chlorine.
【０００９】[0009]
【作用】この発明の分散型ＥＬ素子においては、発光体
層の背面の絶縁層に用いられているチタン酸バリウムの
粉末に塩素等の陰イオンが含まれており、輝度が半減す
るまでの時間が長い。In the dispersion type EL device of the present invention, the barium titanate powder used for the insulating layer on the back surface of the light emitting layer contains anions such as chlorine, and the time until the brightness is reduced to half is obtained. Is long.
【００１０】[0010]
【実施例】図１はこの発明に係る分散型ＥＬ素子の基本
構造を示す断面図である。図において、１はＺｎＳ系の
蛍光体の粉末をバインダ中に分散させた発光体層で、２
０〜６０μｍの厚さに形成されている。２はＡ１箔等の
背面電極、３は発光体層１と背面電極２との間に設けら
れた絶縁層で、シアノエチル化された有機バインダ中に
高誘電体であるＢａＴｉＯ3 （チタン酸バリウム）粉末
を分散させた誘電体層となっており、２０〜４０μｍの
厚さに形成されている。また、そのＢａＴｉＯ3 粉末に
は、陰イオンが含有されている。1 is a sectional view showing the basic structure of a dispersion type EL element according to the present invention. In the figure, reference numeral 1 is a light-emitting layer in which a ZnS-based phosphor powder is dispersed in a binder.
It is formed to a thickness of 0 to 60 μm. 2 is a back electrode such as A1 foil, 3 is an insulating layer provided between the light emitting layer 1 and the back electrode 2, and is BaTiO 3 (barium titanate) which is a high dielectric substance in a cyanoethylated organic binder. It is a dielectric layer in which powder is dispersed and is formed to a thickness of 20 to 40 μm. Further, the BaTiO 3 powder contains anions.
【００１１】４はＩＴＯ膜等の透明電極、５は透明電極
４の外側に設けられたポリエチレンテレフタラートから
成るＰＥＴフィルム、６，７はＰＥＴフィルム５及び背
面電極２の外側を覆うナイロン系の補水フィルム、８，
９は補水フイルム６，７の外側からパッケージしている
エチレン系の防湿フィルムである。Reference numeral 4 is a transparent electrode such as an ITO film, 5 is a PET film made of polyethylene terephthalate provided on the outside of the transparent electrode 4, and 6 and 7 are nylon type replenishing water covering the outside of the PET film 5 and the back electrode 2. Film, 8,
Reference numeral 9 is an ethylene-based moisture-proof film that is packaged from the outside of the water replenishment films 6 and 7.
【００１２】上記のような構造の分散型ＥＬ素子は、Ａ
１箔等の背面電極２上に、有機バインダ中にＢａＴｉ０
3 粉末を分散させた絶縁層３をスクリーン印刷法等によ
り形成し、更にその上に同様の形成方法にて発光体層１
を積層する。また、ＰＥＴフィルム５上に透明電極４を
真空蒸着、スパッタ法等により形成し、この透明電極４
を形成したＰＥＴフィルム５と発光体層１をラミネート
法により熱圧着し、その外側から補水フィルム６，７で
覆い、更に防湿フイルム８，９でパッケージすることに
より得られる。The dispersion type EL device having the above structure is
1 on the back electrode 2 such as foil, BaTi0 in an organic binder
An insulating layer 3 in which 3 powders are dispersed is formed by a screen printing method or the like, and a light emitting layer 1 is further formed thereon by the same forming method.
Are stacked. In addition, the transparent electrode 4 is formed on the PET film 5 by vacuum vapor deposition, sputtering or the like.
It is obtained by thermocompression bonding the PET film 5 on which the above is formed and the light emitting layer 1 by a laminating method, covering with water replenishing films 6 and 7 from the outside, and further packaging with moisture-proof films 8 and 9.
【００１３】そして、このようにして得られたＥＬ素子
は、従来と同様面状の光源として利用されるが、ここで
安定な動作を確保するために重要な絶縁層３のＢａＴｉ
Ｏ3粉末には不純物である陰イオンが含まれている。こ
のため、輝度の半減時間が長く、寿命の長いものとなっ
ており、ＬＣＤ等のバックライトなど使用範囲が広い。The EL element thus obtained is used as a planar light source as in the conventional case, but the BaTi of the insulating layer 3 is important here for ensuring stable operation.
The O 3 powder contains anions that are impurities. Therefore, the half-life time of the luminance is long, the life is long, and the range of use such as a backlight of LCD is wide.
【００１４】図２は上記のように絶縁層３に陰イオンを
含む分散型ＥＬ素子のライフテストの結果を示したもの
であり、ここでは特に効果のある塩素（Ｃｌ）をＢａＴ
ｉＯ3 粉末に含有させた時の輝度維持率（％）−駆動時
間（ｈｒ）の関係を示している。図中、実線は塩素を含
まない従来品、破線は塩素を混入させた本実施例の改良
品の特性をそれぞれ示しており、図５と同様１００Ｖ・
４００Ｈｚの交流駆動を行った場合を示している。FIG. 2 shows the result of the life test of the dispersion type EL element containing the anion in the insulating layer 3 as described above. Here, chlorine (Cl), which is particularly effective, is added to BaT.
The relationship between the luminance maintenance ratio (%) and the driving time (hr) when the powder is contained in the iO 3 powder is shown. In the figure, the solid line shows the characteristics of the conventional product containing no chlorine, and the broken line shows the characteristics of the improved product of this embodiment mixed with chlorine.
The case where AC drive of 400 Hz is performed is shown.
【００１５】図示のように、本実施例におけるＥＬ素子
は、従来品に比べ輝度の半減時間が１７００ｈｒであ
り、寿命が約２倍となっている。ここで、一般的に分散
型ＥＬ素子の絶縁層として用いられるものは、電気絶縁
性が優れ、誘電率の高いＢａＴｉＯ3 粉末を高誘電率の
有機バインダ中に分散させたものが使用されているが、
このＢａＴｉＯ3 粉末の含有塩素量を１０〜１００００
ｐｐｍにコントロールすることにより、長寿命化が図ら
れることが実験結果明らかになった。As shown in the figure, the EL element of this embodiment has a luminance half-life of 1700 hours and a life of about twice that of the conventional product. Here, what is generally used as an insulating layer of a dispersion type EL element is one in which BaTiO 3 powder having excellent electric insulation and a high dielectric constant is dispersed in an organic binder having a high dielectric constant. But,
The content of chlorine in this BaTiO 3 powder is 10 to 10,000.
It has been clarified by experiments that the life can be extended by controlling the concentration to be ppm.
【００１６】この長寿命化となる原因としては、電気絶
縁材料（無定型，微結晶質の集合体）の電流を支配して
いるイオンが考えられ、ＢａＴｉＯ3 粉末が塩素を含有
することにより、絶縁層３に電界が加わった時に−イオ
ンが活発に動いてＥＬ素子全体に電流が流れ易くなり、
輝度の上昇が含有塩素量に比例して大きくなるためと思
われる。Ions that control the electric current of the electrically insulating material (amorphous, microcrystalline aggregate) are considered to be the cause of the extension of the life, and the BaTiO 3 powder containing chlorine causes When an electric field is applied to the insulating layer 3, − ions are actively moved and a current easily flows through the entire EL element,
It seems that the increase in brightness increases in proportion to the content of chlorine.
【００１７】図３は上記塩素の含有量を５００ｐｐｍ及
び１０００ｐｐｍとした時のＥＬ素子の電流変化率
（％）と駆動時間（ｈｒ）との関係、また図４はその時
の輝度維持率（％）と駆動時間（ｈｒ）との関係をそれ
ぞれ示したものであり、実線は従来品、破線は含有塩素
量が５００ｐｐｍの改良品、鎖線は含有塩素量が１００
０ｐｐｍの改良品の特性をそれぞれ示している。FIG. 3 shows the relationship between the current change rate (%) of the EL element and the driving time (hr) when the chlorine content is 500 ppm and 1000 ppm, and FIG. 4 shows the luminance maintenance rate (%) at that time. And the driving time (hr) are shown respectively. The solid line shows the conventional product, the broken line shows the improved product with chlorine content of 500 ppm, and the broken line shows the chlorine content of 100 ppm.
The characteristics of the improved product of 0 ppm are shown.
【００１８】図３の電流変化率−駆動時間のグラフに見
られるように、含有塩素量が５００ｐｐｍ，１０００ｐ
ｐｍと増加していくにつれてＥＬ素子全体に電流が流れ
易くなる。これに伴って、ＥＬ特性の中で初期劣化とい
われている輝度の上昇が図４の輝度維持率−駆動時間の
グラフに見られるように、含有塩素量に比例して大きく
なる。すなわち、図３，図４から輝度維持率−電流変化
率の相関関係が認められる。As can be seen from the graph of current change rate-driving time in FIG. 3, the chlorine content is 500 ppm, 1000 p
As it increases to pm, the current easily flows through the entire EL element. Along with this, the increase in luminance, which is said to be the initial deterioration in the EL characteristics, increases in proportion to the amount of contained chlorine, as seen in the graph of luminance maintenance ratio-driving time in FIG. That is, the correlation between the luminance maintenance rate and the current change rate is recognized from FIGS. 3 and 4.
【００１９】よって、塩素を含有したＢａＴｉＯ3 粉末
を絶縁層３に用いることにより、絶縁層３自身の特性は
損なわず、塩素による初期状態に起こる輝度の上昇が大
きくなり、分散型ＥＬ素子の寿命特性を大きく改善する
ことができる。Therefore, by using chlorine-containing BaTiO 3 powder for the insulating layer 3, the characteristics of the insulating layer 3 itself are not impaired, and the increase in brightness caused by chlorine in the initial state is increased, and the life of the dispersion type EL device is increased. The characteristics can be greatly improved.
【００２０】表１に上述のＢａＴｉＯ3 粉末の塩素含有
量と輝度及び寿命の関係を示す。Table 1 shows the relationship between the chlorine content of the above BaTiO 3 powder and the brightness and life.
【００２１】[0021]
【表１】 [Table 1]
【００２２】Ｎｏ．１の塩素含有量が０ｐｐｍの従来品
では輝度半減時間が約９００ｈｒ（初期輝度６０ｃｄ／
ｍ2 一定とする）であるのに比べ、Ｎｏ．２，３の塩素
含有量が５００ｐｐｍ，１０００ｐｐｍの改良品では輝
度半減時間が約１１００ｈｒ，１７００ｈｒとなり、Ｂ
ａＴｉＯ3 粉末に塩素を１０〜１００００ｐｐｍ含有さ
せることにより寿命を大きく延ばすことができる。No. The luminance half-life is about 900 hr (initial luminance 60 cd /
m 2 is kept constant), while No. In the improved products with a chlorine content of a few 500 ppm and 1000 ppm, the luminance half time is about 1100 hr and 1700 hr, and B
The life of the aTiO 3 powder can be greatly extended by containing 10 to 10,000 ppm of chlorine.
【００２３】[0023]
【発明の効果】以上のように、この発明によれば、発光
体層の背面側の絶縁層に用いるチタン酸バリウムの粉末
に陰イオンを含有させたため、輝度半減時間が延び、寿
命が長くなり、使用範囲が広くなるという効果が得られ
る。As described above, according to the present invention, the anion is contained in the powder of barium titanate used for the insulating layer on the back side of the light emitting layer, so that the luminance half time is extended and the life is extended. The effect of widening the range of use is obtained.
【図１】 この発明に係る分散型ＥＬ素子の基本構造を
示す断面図FIG. 1 is a sectional view showing a basic structure of a dispersion type EL device according to the present invention.
【図２】 図１のＥＬ素子の輝度維持率と駆動時間との
関係を示す特性図FIG. 2 is a characteristic diagram showing a relationship between a luminance retention rate and a driving time of the EL element of FIG.
【図３】 図１の絶縁層に塩素を含有させた時の電流変
化率と駆動時間との関係を示す特性図FIG. 3 is a characteristic diagram showing a relationship between a current change rate and a driving time when chlorine is contained in the insulating layer of FIG.
【図４】 図１の絶縁層に塩素を含有させた時の輝度維
持率と駆動時間との関係を示す特性図FIG. 4 is a characteristic diagram showing a relationship between a luminance retention rate and a driving time when chlorine is contained in the insulating layer of FIG.
【図５】 従来例の輝度維持率と駆動時間との関係を示
す特性図FIG. 5 is a characteristic diagram showing a relationship between a luminance maintenance ratio and a driving time in a conventional example.
１ 発光体層 ２ 背面電極 ３ 絶縁層 ４ 透明電極 1 luminous body layer 2 back electrode 3 insulating layer 4 transparent electrode
【手続補正書】[Procedure amendment]
【提出日】平成６年２月７日[Submission date] February 7, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図２[Name of item to be corrected] Figure 2
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図２】 [Fig. 2]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図３[Name of item to be corrected] Figure 3
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図３】 [Figure 3]
【手続補正３】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図４[Name of item to be corrected] Fig. 4
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図４】 [Figure 4]
Claims (2)
リウムの粉末を分散した絶縁層を有し、そのチタン酸バ
リウムの粉末が陰イオンを含有していることを特徴とす
る分散型ＥＬ素子。1. A dispersion type having an insulating layer in which barium titanate powder is dispersed between a light emitting layer and a back electrode, the barium titanate powder containing anions. EL element.
１００００ｐｐｍ含有していることを特徴とする請求項
１記載の分散型ＥＬ素子。2. The barium titanate powder contains 10 to 10 chlorine.
The dispersion type EL element according to claim 1, wherein the dispersion type EL element contains 10000 ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP42A JPH06223973A (en) | 1992-09-22 | 1992-09-22 | Dispersion type el element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP42A JPH06223973A (en) | 1992-09-22 | 1992-09-22 | Dispersion type el element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06223973A true JPH06223973A (en) | 1994-08-12 |
Family
ID=17244846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP42A Pending JPH06223973A (en) | 1992-09-22 | 1992-09-22 | Dispersion type el element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06223973A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS563991A (en) * | 1979-06-23 | 1981-01-16 | Nippon Electric Co | Electric field light emitting lamp |
| JPH01264196A (en) * | 1988-04-13 | 1989-10-20 | Nec Kansai Ltd | Dispersion type electroluminescent element |
| JPH0230090A (en) * | 1988-04-21 | 1990-01-31 | Olympus Optical Co Ltd | Thin film el element |
| JPH0272594A (en) * | 1988-09-07 | 1990-03-12 | Fujitsu Ltd | Film el panel |
| JPH0290489A (en) * | 1988-09-28 | 1990-03-29 | Hitachi Ltd | Distributed el element |
-
1992
- 1992-09-22 JP JP42A patent/JPH06223973A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS563991A (en) * | 1979-06-23 | 1981-01-16 | Nippon Electric Co | Electric field light emitting lamp |
| JPH01264196A (en) * | 1988-04-13 | 1989-10-20 | Nec Kansai Ltd | Dispersion type electroluminescent element |
| JPH0230090A (en) * | 1988-04-21 | 1990-01-31 | Olympus Optical Co Ltd | Thin film el element |
| JPH0272594A (en) * | 1988-09-07 | 1990-03-12 | Fujitsu Ltd | Film el panel |
| JPH0290489A (en) * | 1988-09-28 | 1990-03-29 | Hitachi Ltd | Distributed el element |
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| Date | Code | Title | Description |
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| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19971209 |