JP5744621B2 - Dispersion type EL device and manufacturing method thereof - Google Patents
Dispersion type EL device and manufacturing method thereof Download PDFInfo
- Publication number
- JP5744621B2 JP5744621B2 JP2011115334A JP2011115334A JP5744621B2 JP 5744621 B2 JP5744621 B2 JP 5744621B2 JP 2011115334 A JP2011115334 A JP 2011115334A JP 2011115334 A JP2011115334 A JP 2011115334A JP 5744621 B2 JP5744621 B2 JP 5744621B2
- Authority
- JP
- Japan
- Prior art keywords
- dielectric
- dispersion type
- intermediate layer
- layer
- light emitting
- 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.)
- Expired - Fee Related
Links
Description
本発明は、分散型エレクトロルミネセンス（以下、分散型ＥＬという）素子およびその製造方法に関する。 The present invention relates to a dispersive electroluminescence (hereinafter referred to as dispersive EL) element and a manufacturing method thereof.
従来から面発光型光源として知られている分散型ＥＬ素子１１０は、図５に示すように、ポリエチレンテレフタレート等からなるベースフィルム１０１の片面に、ＩＴＯ（酸化インジウム）等からなる透明電極１０２と、バインダー１０３Ａ中に蛍光体粉末１０３Ｂを分散してなる発光層１０３と、バインダー１０４Ａ中に誘電体粉末１０４Ｂを分散してなる誘電体層１０４と、アルミニウム、銀、カーボン等からなる背面電極１０５とを順次積層して構成される。 As shown in FIG. 5, a dispersion type EL element 110 conventionally known as a surface-emitting light source includes a transparent electrode 102 made of ITO (indium oxide) or the like on one side of a base film 101 made of polyethylene terephthalate or the like, A light emitting layer 103 in which phosphor powder 103B is dispersed in a binder 103A, a dielectric layer 104 in which dielectric powder 104B is dispersed in a binder 104A, and a back electrode 105 made of aluminum, silver, carbon or the like. It is constructed by stacking sequentially.
分散型ＥＬの発光輝度を高めることを目的として発光層１０３中の蛍光体粉末１０３Ｂの充填率を高めた場合、図６に示すように、発光層１０３表面の凹凸が大きくなるため、発光層１０３とその上に積層される誘電体層１０４との密着性が悪くなり、誘電体層１０４が剥離しやすくなったり、発光が不均一になるという問題があった。この理由として、バインダー１０４Ａ中に誘電体層１０４を分散混合した誘電体ペーストの粘性が高く、発光層１０３表面の凹凸を吸収しきれず気泡１９０が出来てしまうことが原因と考えられている。 When the filling rate of the phosphor powder 103B in the light emitting layer 103 is increased for the purpose of increasing the light emission luminance of the dispersion type EL, the surface of the light emitting layer 103 becomes uneven as shown in FIG. There is a problem in that the adhesion between the dielectric layer 104 and the dielectric layer 104 laminated thereon deteriorates, the dielectric layer 104 becomes easy to peel off, and the light emission becomes uneven. The reason for this is thought to be that the dielectric paste in which the dielectric layer 104 is dispersed and mixed in the binder 104A has a high viscosity and cannot absorb the irregularities on the surface of the light emitting layer 103, thereby forming bubbles 190.
そこで、特許文献１では、図７に示すように、発光層１０３と誘電体層１０４との間にフッ素系樹脂からなる中間層１０６を設けることにより、発光層１０３表面の凹凸を吸収して密着性を高めることが提案されている。特許文献１には、密着性を高める効果を得るためには、中間層１０６の膜厚は少なくとも１μｍは必要であることが記載されている。 Therefore, in Patent Document 1, as shown in FIG. 7, by providing an intermediate layer 106 made of a fluorine-based resin between the light emitting layer 103 and the dielectric layer 104, the unevenness on the surface of the light emitting layer 103 is absorbed and adhered. It has been proposed to increase the nature. Patent Document 1 describes that the film thickness of the intermediate layer 106 needs to be at least 1 μm in order to obtain the effect of improving the adhesion.
しかしながら、中間層１０６を構成するフッ素系樹脂の比誘電率は１０前後であり、誘電損失も大きい。このため、特許文献１に提案された方法では、中間層１０６の膜厚を厚くするにしたがって発光層１０３に掛かる電圧が小さくなり輝度および発光効率が低下するのが避けられない。 However, the relative permittivity of the fluororesin constituting the intermediate layer 106 is around 10, and the dielectric loss is large. For this reason, in the method proposed in Patent Document 1, it is inevitable that the voltage applied to the light emitting layer 103 decreases as the thickness of the intermediate layer 106 increases, and the luminance and light emission efficiency decrease.
本発明は、上記の技術的課題を解決するためになされたものであり、発光均一性を向上させつつ、輝度および発光効率の低下を抑制することを目的とする。 The present invention has been made to solve the above technical problem, and an object of the present invention is to suppress a decrease in luminance and light emission efficiency while improving light emission uniformity.
分散型ＥＬ素子は、基板上に形成された透明電極、発光層、誘電体層、および背面電極を積層して構成される。本発明に係る分散型ＥＬ素子では、前記発光層と前記誘電体層との間に、バインダー中に誘電体粉末を分散してなる中間層が形成されている。前記中間層は、前記誘電体粉末がバインダー中に分散混合されたペーストを前記発光層上に塗布することにより形成される。 The dispersion type EL element is configured by laminating a transparent electrode, a light emitting layer, a dielectric layer, and a back electrode formed on a substrate. In the dispersion type EL device according to the present invention, an intermediate layer in which a dielectric powder is dispersed in a binder is formed between the light emitting layer and the dielectric layer. The intermediate layer is formed by applying a paste in which the dielectric powder is dispersed and mixed in a binder onto the light emitting layer.
ここで、ペーストの粘性を低くして確実に発光層表面の凹凸を吸収するために、前記中間層中の誘電体粉末の混合率は、誘電体層のそれに比べて低いことが望ましい。 Here, in order to reliably absorb the irregularities on the surface of the light emitting layer by reducing the viscosity of the paste, it is desirable that the mixing ratio of the dielectric powder in the intermediate layer is lower than that of the dielectric layer.
本発明の構成によると、発光層表面の凹凸が中間層により吸収され、発光均一性が向上する。また、中間層はバインダー中に誘電体粉末が分散されてなるため、発光層に掛かる電圧が小さくなることがなく、輝度および発光効率の低下が抑制される。 According to the configuration of the present invention, unevenness on the surface of the light emitting layer is absorbed by the intermediate layer, and the light emission uniformity is improved. In addition, since the dielectric powder is dispersed in the binder in the intermediate layer, the voltage applied to the light emitting layer is not reduced, and the decrease in luminance and light emission efficiency is suppressed.
前記誘電体粉末としては、酸化チタン、チタン酸バリウム、ジルコニア、イットリア、チタン酸ストロンチウム、または酸化タンタルのいずれかの酸化物誘電体の粉末を好適に用いることが出来る。前記バインダーとしては、フッ素系樹脂が好適である。 As the dielectric powder, an oxide dielectric powder of titanium oxide, barium titanate, zirconia, yttria, strontium titanate, or tantalum oxide can be suitably used. As the binder, a fluororesin is suitable.
なお、前記発光層を形成する前にあらかじめ透明電極表面に紫外線照射処理を施しても良い。これによると、透明電極表面の親油性が向上し、透明電極上に形成される発光層の密着性が向上する。 In addition, before forming the said light emitting layer, you may give an ultraviolet irradiation process to the transparent electrode surface previously. According to this, the lipophilicity of the transparent electrode surface is improved, and the adhesion of the light emitting layer formed on the transparent electrode is improved.
本発明によれば、発光均一性を向上させつつ、輝度および発光効率の低下を抑制することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the fall of a brightness | luminance and luminous efficiency, improving luminous uniformity.
図１を用いて、本発明の実施形態に係る分散型ＥＬ素子の概略構成を説明する。図１に示す分散型ＥＬ素子１０は、基板１、透明電極２、発光層３、中間層６、誘電体層４および背面電極５を順次積層した構成を有する。 A schematic configuration of a dispersion type EL element according to an embodiment of the present invention will be described with reference to FIG. A dispersion type EL element 10 shown in FIG. 1 has a configuration in which a substrate 1, a transparent electrode 2, a light emitting layer 3, an intermediate layer 6, a dielectric layer 4 and a back electrode 5 are sequentially laminated.
基板１としては、透湿性、吸湿性が低い任意の樹脂フィルムを用いることができるが、耐熱性が良好であることから、ポリエチレンテレフタレートなどの耐熱性樹脂フィルムが特に好適である。また膜厚に関しては、面状発光体のフレキシビリティを改善するため、０．３０ｍｍ以下のものが特に好ましい。 As the substrate 1, any resin film having low moisture permeability and hygroscopicity can be used. However, since the heat resistance is good, a heat resistant resin film such as polyethylene terephthalate is particularly suitable. As for the film thickness, a film thickness of 0.30 mm or less is particularly preferable in order to improve the flexibility of the planar light emitter.
透明電極２は、ＩＴＯ等の透明導電体を前記ベースフィルム１の片面に、例えば、スパッタ成膜等することによって形成される。 The transparent electrode 2 is formed by depositing a transparent conductor such as ITO on one side of the base film 1, for example, by sputtering.
発光層３は、熱可塑性樹脂からなるバインダー３Ａ中に、蛍光体粉末３Ｂを均一分散したものからなる。 The light emitting layer 3 is formed by uniformly dispersing phosphor powder 3B in a binder 3A made of a thermoplastic resin.
バインダー３Ａを構成する材料としては、熱可塑性の樹脂、例えばフッ素ゴム系樹脂、フッ素系樹脂、アクリル系樹脂、ポリプロピレン系樹脂、ポリスチレン系樹脂、ポリ塩化ビニルなど、熱によって軟化する樹脂材料が用いられる。 As a material constituting the binder 3A, a thermoplastic resin such as a fluororubber resin, a fluorine resin, an acrylic resin, a polypropylene resin, a polystyrene resin, or polyvinyl chloride is used. .
また、蛍光体粉末３Ｂとしては、公知に属する任意の蛍光体の粉末を用いることができるが、強い発光強度が得られることなどから、硫化亜鉛（ＺｎＳ）中に銅と塩素とを添加（ドープ）したものなどが特に好適である。 As the phosphor powder 3B, any phosphor powder known in the art can be used. However, since strong emission intensity is obtained, copper and chlorine are added to zinc sulfide (ZnS) (dope). And the like are particularly suitable.
発光層３は、蛍光体粉末３Ｂをバインダー３Ａ中に混合した蛍光体ペーストを、ベースフィルム１上に形成された透明電極２上に、例えばスクリーン印刷等により均一な厚さで塗布した後、焼成することにより形成される。 The light-emitting layer 3 is obtained by applying a phosphor paste obtained by mixing phosphor powder 3B in a binder 3A onto the transparent electrode 2 formed on the base film 1 with a uniform thickness, for example, by screen printing or the like, followed by firing. It is formed by doing.
中間層６は、熱可塑性樹脂からなるバインダー６Ａ中に誘電体粉末６Ｂを均一に分散したものからなる。 The intermediate layer 6 is formed by uniformly dispersing the dielectric powder 6B in a binder 6A made of a thermoplastic resin.
バインダー６Ａの材料としては、上述の発光層３のバインダー３Ａの材料と同種のものを用いることができる。 As the material of the binder 6A, the same material as the material of the binder 3A of the light emitting layer 3 described above can be used.
また、誘電体粉末６Ｂとしては、チタン酸バリウム（ＢａＴｉＯ３）または酸化チタン（ＴｉＯ２）の粉末を好適に用いることができる。チタン酸バリウム、酸化チタンのほか、ジルコニア（ＺｒＯ２）、イットリア（Ｙ２Ｏ３）、チタン酸ストロンチウム（ＳｒＴｉＯ３）、酸化タンタル（Ｔａ２Ｏ５）などの酸化物誘電体でもよく、この限りではない。 As the dielectric powder 6B, a powder of barium titanate (BaTiO 3 ) or titanium oxide (TiO 2 ) can be suitably used. In addition to barium titanate and titanium oxide, oxide dielectrics such as zirconia (ZrO2), yttria (Y 2 O 3 ), strontium titanate (SrTiO 3 ), and tantalum oxide (Ta 2 O 5 ) may be used. Absent.
中間層６は、バインダー６Ａを溶剤に溶かしたものに、誘電体粉末６Ｂを分散混合して得られる誘電体ペーストを、発光層３上に、例えばスクリーン印刷等により均一な厚さに塗布することによって形成される。ここで、ペーストの粘性を低くして確実に発光層３表面の凹凸を吸収するために、中間層６中の誘電体粉末６Ｂの混合率は、誘電体層４のそれに比べて低いことが望ましい。 For the intermediate layer 6, a dielectric paste obtained by dispersing and mixing the dielectric powder 6B in a binder 6A dissolved in a solvent is applied on the light emitting layer 3 to a uniform thickness by, for example, screen printing. Formed by. Here, the mixing ratio of the dielectric powder 6B in the intermediate layer 6 is desirably lower than that of the dielectric layer 4 in order to reduce the viscosity of the paste and reliably absorb the irregularities on the surface of the light emitting layer 3. .
誘電体層４は、熱可塑性樹脂からなるバインダー４Ａ中に誘電体粉末４Ｂを均一に分散したものからなる。 The dielectric layer 4 is formed by uniformly dispersing the dielectric powder 4B in a binder 4A made of a thermoplastic resin.
バインダー４Ａの材料としては、上述の発光層３のバインダー３Ａの材料と同種のものを用いることができる。 As the material of the binder 4A, the same material as the material of the binder 3A of the light emitting layer 3 described above can be used.
誘電体粉末４Ｂの材料としては、上述の中間層６の誘電体粉末６Ｂの材料と同種のものを用いることができる。 As the material of the dielectric powder 4B, the same material as that of the dielectric powder 6B of the intermediate layer 6 described above can be used.
誘電体層４は、バインダー４Ａを溶剤に溶かしたものに、誘電体粉末４Ｂを分散混合して得られる誘電体ペーストを、中間層６上に、例えばスクリーン印刷等により均一な厚さに塗布した後、焼成することによって形成される。 For the dielectric layer 4, a dielectric paste obtained by dispersing and mixing the dielectric powder 4B in a binder 4A dissolved in a solvent was applied on the intermediate layer 6 to a uniform thickness by, for example, screen printing. Thereafter, it is formed by firing.
背面電極５は、例えばアルミニウムなどの導電性金属材料を、誘電層４上に真空成膜することで形成される。また銀ペーストなどの導電性ペーストをスクリーン印刷することもできる。 The back electrode 5 is formed by vacuum-depositing a conductive metal material such as aluminum on the dielectric layer 4. Alternatively, a conductive paste such as a silver paste can be screen-printed.
このようにして作製される本発明の分散型ＥＬ素子は、発光層と誘電体層との間にバインダー中に誘電体粉末を分散してなる中間層が形成されていることにより、発光均一性を向上させつつ、輝度および発光効率の低下が抑制可能である。 In the dispersion type EL device of the present invention thus produced, the light emitting uniformity is obtained by forming an intermediate layer in which a dielectric powder is dispersed in a binder between the light emitting layer and the dielectric layer. It is possible to suppress a decrease in luminance and light emission efficiency while improving the brightness.
以下に、本実施の形態に係る分散型ＥＬ素子の実施例を掲げ、本発明の効果を明らかにする。 Hereinafter, examples of the dispersion-type EL element according to this embodiment will be described to clarify the effects of the present invention.
＜実施例１＞
片面にＩＴＯ（酸化インジウムスズ）の透明導電膜（透明電極２）を形成したＰＥＴフィルム（基板１）のＩＴＯ透明導電膜側に発光層３、中間層６、誘電体層４および背面電極５を順次積層することにより、図１に示す構造の分散型ＥＬ素子１０を作製した。発光層３は、蛍光体粉末（オスラムシルバニア社製GC45）およびフッ素系の樹脂、溶剤を蛍光体と樹脂の重量比が４：１となるように分散混合した蛍光体ペースト（（有）イメージテック社製）を透明電極２上に塗布し、焼成後の膜厚が約８０μｍとなるように成膜した。中間層６は、チタン酸バリウム粉末をフッ素系樹脂中に分散混合した誘電体ペーストを発光層３上に均一に塗布して形成した。フッ素系樹脂に対するチタン酸バリウムの混合率は体積比で５〜２０％の範囲とし、中間層６の膜厚は１〜１０μｍとした。誘電体層４はチタン酸バリウム粉末とフッ素系樹脂を重量比３：１（体積比１：１）で混合した誘電体ペーストを中間層６上に塗布し、焼成後の膜厚が約３０μｍとなるように成膜した。背面電極５は、アルミニウムを、誘電層４上に真空成膜することで形成した。
<Example 1>
A light emitting layer 3, an intermediate layer 6, a dielectric layer 4 and a back electrode 5 are provided on the ITO transparent conductive film side of a PET film (substrate 1) having a transparent conductive film (transparent electrode 2) made of ITO (indium tin oxide) on one side. By sequentially laminating, a dispersion type EL element 10 having the structure shown in FIG. 1 was produced. The light-emitting layer 3 is a phosphor paste (ImageTech) in which phosphor powder (GC45 manufactured by OSRAM Sylvania), fluorine resin, and solvent are dispersed and mixed so that the weight ratio of phosphor to resin is 4: 1. The film was formed on the transparent electrode 2 so that the film thickness after firing was about 80 μm. The intermediate layer 6 was formed by uniformly applying a dielectric paste, in which barium titanate powder was dispersed and mixed in a fluororesin, onto the light emitting layer 3. The mixing ratio of barium titanate to the fluororesin was in the range of 5 to 20% by volume, and the film thickness of the intermediate layer 6 was 1 to 10 μm. The dielectric layer 4 is formed by applying a dielectric paste obtained by mixing barium titanate powder and fluororesin at a weight ratio of 3: 1 (volume ratio 1: 1) on the intermediate layer 6 and having a film thickness after firing of about 30 μm. The film was formed as follows. The back electrode 5 was formed by vacuum-depositing aluminum on the dielectric layer 4.
＜実施例２＞
実施例２の分散型ＥＬ素子は、実施例１の分散型ＥＬ素子に対して中間層６の誘電体材料が異なるものである。中間層６は、酸化チタン粉末をフッ素系樹脂中に分散混合した誘電体ペーストを発光層３上に均一に塗布して形成される。フッ素系樹脂に対する酸化チタンの混合率は体積比で２〜２５％の範囲とし、それ以外は実施例１と同様の方法で図１に示すような分散型ＥＬ素子１０を作製した。
<Example 2>
The dispersion type EL element of Example 2 is different from the dispersion type EL element of Example 1 in the dielectric material of the intermediate layer 6. The intermediate layer 6 is formed by uniformly applying a dielectric paste obtained by dispersing and mixing titanium oxide powder in a fluorine-based resin on the light emitting layer 3. A dispersion type EL element 10 as shown in FIG. 1 was produced in the same manner as in Example 1 except that the mixing ratio of titanium oxide to the fluorine-based resin was in the range of 2 to 25% by volume.
＜比較例１＞
比較例１の分散型ＥＬ素子は、図７に示すように、誘電体粉末を含まないフッ素系樹脂のみから成る中間層１０６を有する従来の分散型ＥＬ素子である。中間層６は、フッ素系樹脂のみのペーストを発光層３上に塗布して形成される。中間層６の膜厚は１〜３μｍとした。それ以外は、実施例１と同様にして図７に示すような分散型ＥＬ素子２１０を作製した。
<Comparative Example 1>
As shown in FIG. 7, the dispersion type EL element of Comparative Example 1 is a conventional dispersion type EL element having an intermediate layer 106 made of only a fluorine-based resin that does not contain dielectric powder. The intermediate layer 6 is formed by applying a paste containing only a fluorine resin on the light emitting layer 3. The film thickness of the intermediate layer 6 was 1 to 3 μm. Otherwise, a dispersion type EL element 210 as shown in FIG.
＜比較例２＞
比較例２の分散型ＥＬ素子は、比較例１と同様の構成を備えた従来の分散型ＥＬ素子２１０において、中間層１０６の膜厚を厚くしたものである。すなわち、比較例１の分散型ＥＬ素子の製造工程において、フッ素系樹脂ペーストの塗布工程を増やし、中間層１０６を厚くした。それ以外は、比較例１と同様にして図７に示すような分散型ＥＬ素子２１０を作製した。
<Comparative Example 2>
The dispersion type EL element of Comparative Example 2 is obtained by increasing the thickness of the intermediate layer 106 in the conventional dispersion type EL element 210 having the same configuration as that of Comparative Example 1. That is, in the manufacturing process of the dispersion type EL element of Comparative Example 1, the number of fluorine resin paste application processes was increased, and the intermediate layer 106 was thickened. Otherwise, a dispersion type EL element 210 as shown in FIG.
＜比較例３＞
比較例３の分散型ＥＬ素子は、図５に示すように、中間層をもたない従来の分散型ＥＬ素子である。すなわち、実施例１の分散型ＥＬ素子の製造工程において、誘電体層４はチタン酸バリウム粉末とフッ素系樹脂を重量比３：１（体積比１：１）で混合した誘電体ペーストを発光層３上に塗布し、焼成後の膜厚が約３０μｍとなるように成膜した。それ以外は、実施例１と同様にして図５に示すような分散型ＥＬ素子１１０を作製した。
<Comparative Example 3>
The dispersion type EL element of Comparative Example 3 is a conventional dispersion type EL element having no intermediate layer as shown in FIG. That is, in the manufacturing process of the dispersion type EL element of Example 1, the dielectric layer 4 is formed by using a dielectric paste obtained by mixing barium titanate powder and a fluororesin at a weight ratio of 3: 1 (volume ratio of 1: 1). The film was formed on the film 3 so that the film thickness after baking was about 30 μm. Other than that, a dispersion type EL element 110 as shown in FIG.
＜発光均一性試験＞
中間層中のチタン酸バリウム粉末の混合率の異なる実施例１の分散型ＥＬ素子の３つのサンプル（バインダーに対する体積比で、５％、１０％および２０％）および中間層中の酸化チタン粉末の混合率の異なる実施例２の分散型ＥＬ素子の４つのサンプル（バインダーに対する体積比で、２％、５％、１５％および２５％）を用意し、発光均一性を５段階の指標（図２参照。）で評価した。その結果を表１に示す。比較のため、中間層をもたない比較例３の分散型ＥＬ素子でも評価を行った。
<Light emission uniformity test>
Three samples (5%, 10% and 20% by volume ratio with respect to the binder) of the dispersion type EL device of Example 1 having different mixing ratios of the barium titanate powder in the intermediate layer and the titanium oxide powder in the intermediate layer Four samples (2%, 5%, 15% and 25% by volume ratio with respect to the binder) of the dispersion type EL elements of Example 2 having different mixing ratios were prepared, and the emission uniformity was measured in five steps (FIG. 2). Reference). The results are shown in Table 1. For comparison, the dispersion type EL element of Comparative Example 3 having no intermediate layer was also evaluated.
発光均一性は、実用上４．５以上であることが求められる。中間層をもたない比較例３のサンプルでは、発光均一性が非常に低い。これは発光層３表面の凹凸１９０（図６参照。）を吸収しきれず気泡が数多く残留することが原因である。実施例１、実施例２のサンプルでは、発光均一性が大幅に向上する。中間層６中の誘電体粉末の混合率は、高くても２５％と誘電体層４中のそれ（５０％）に比べて低いことにより、誘電体ペーストの粘性を抑制でき、流動性をある程度維持している。したがって、発光層３表面の凹凸の大部分が吸収され、気泡が残ることがなく、発光均一性が向上するものと推察される。なお、中間層６中の誘電体粉末の混合率は少なすぎると発光均一性が低下するので、適当なところで５〜２５％程度であれば良好な結果が得られている。 The light emission uniformity is required to be 4.5 or more practically. In the sample of Comparative Example 3 having no intermediate layer, the light emission uniformity is very low. This is because the unevenness 190 (see FIG. 6) on the surface of the light emitting layer 3 cannot be absorbed and many bubbles remain. In the samples of Examples 1 and 2, the light emission uniformity is greatly improved. Since the mixing ratio of the dielectric powder in the intermediate layer 6 is at most 25% and lower than that in the dielectric layer 4 (50%), the viscosity of the dielectric paste can be suppressed and the fluidity can be improved to some extent. Is maintained. Therefore, it is assumed that most of the unevenness on the surface of the light emitting layer 3 is absorbed, no bubbles remain, and the light emission uniformity is improved. In addition, if the mixing ratio of the dielectric powder in the intermediate layer 6 is too small, the light emission uniformity is lowered. Therefore, if it is about 5 to 25% at a suitable place, good results are obtained.
＜発光特性試験＞
中間層中のチタン酸バリウム粉末の混合率の異なる実施例１の分散型ＥＬ素子の３つのサンプル（バインダーに対する体積比で、１０％、１５％および２５％）および中間層中の酸化チタン粉末の混合率の異なる実施例２の分散型ＥＬ素子の３つのサンプル（バインダーに対する体積比で、５％、１５％および２５％）を用意し、輝度および発光効率を測定した。その結果を図３、図４にそれぞれ示す。比較のため、中間層がフッ素系樹脂のみから成る比較例１、２の分散型ＥＬ素子でも測定を行った。測定は各サンプルについて正弦波駆動、周波数２ｋＨｚで電圧を変えて行った。
<Light emission characteristic test>
Three samples (10%, 15% and 25% by volume with respect to the binder) of the dispersion type EL device of Example 1 having different mixing ratios of barium titanate powder in the intermediate layer and titanium oxide powder in the intermediate layer Three samples (5%, 15%, and 25% by volume ratio with respect to the binder) of the dispersion type EL elements of Example 2 having different mixing ratios were prepared, and luminance and luminous efficiency were measured. The results are shown in FIGS. 3 and 4, respectively. For comparison, the measurement was also performed on the dispersion type EL elements of Comparative Examples 1 and 2 in which the intermediate layer was made of only a fluororesin. Measurement was performed by changing the voltage at a frequency of 2 kHz with a sine wave drive for each sample.
中間層の膜厚が１μｍ程度である比較例１では、発光層３表面の凹凸を吸収しきれておらず、輝度ムラが発生した。比較例２は中間層の膜厚を厚くして輝度ムラを少なくしたものだが、輝度・発光効率に関しては比較例１と比べて若干の改善は見られるものの劇的なものではなかった。図３に示すように、フッ素系樹脂中にチタン酸バリウムを分散させた中間層を有する実施例１のサンプルは、概ね混合率（体積比）１０％を越えると比較例１、２と比べて輝度・発光効率が向上していることが確認できる。その効果は概ね１５％で最大となり、混合率を２０％まで高めると効果がやや低下することがわかった。また、図４に示すように、フッ素系樹脂中に酸化チタンを分散させた中間層を有する実施例２のサンプルは、概ね混合率（体積比）５％以上で比較例１、２と比べて輝度・発光効率が向上していることが確認できる。実施例２のサンプルでは、酸化チタンの混合率を２５％まで高めてもなお比較例１、２と比べて劣っていないことが分かる。 In Comparative Example 1 in which the film thickness of the intermediate layer was about 1 μm, the unevenness on the surface of the light emitting layer 3 was not completely absorbed, and uneven brightness occurred. In Comparative Example 2, the unevenness of luminance was reduced by increasing the film thickness of the intermediate layer. However, although the luminance and luminous efficiency were slightly improved as compared with Comparative Example 1, it was not dramatic. As shown in FIG. 3, the sample of Example 1 having an intermediate layer in which barium titanate was dispersed in a fluororesin, compared with Comparative Examples 1 and 2 when the mixing ratio (volume ratio) exceeded approximately 10%. It can be confirmed that the luminance and luminous efficiency are improved. It was found that the effect reached a maximum at about 15%, and the effect decreased slightly when the mixing ratio was increased to 20%. Further, as shown in FIG. 4, the sample of Example 2 having an intermediate layer in which titanium oxide is dispersed in a fluororesin has a mixing ratio (volume ratio) of 5% or more, compared with Comparative Examples 1 and 2. It can be confirmed that the luminance and luminous efficiency are improved. It can be seen that the sample of Example 2 is not inferior to Comparative Examples 1 and 2 even when the mixing ratio of titanium oxide is increased to 25%.
＜実施例３＞
実施例３の分散型ＥＬ素子は、実施例１の分散型ＥＬ素子に対して透明電極２の表面状態が異なるものである。すなわち、実施例１の分散型ＥＬ素子の製造過程において、発光層３を形成する前にあらかじめ透明電極２表面に紫外線照射処理を施しておく。それ以外は、実施例１と同様にして図１に示すような分散型ＥＬ素子１０を作製した。この実施例３の分散型ＥＬ素子では、発光均一性が向上した。この原因として、紫外線照射処理により透明電極２表面の親油性が向上し、透明電極２上に形成される発光層３の密着性が向上したためと考えられる。
<Example 3>
The dispersion type EL element of Example 3 is different from the dispersion type EL element of Example 1 in the surface state of the transparent electrode 2. That is, in the manufacturing process of the dispersion-type EL element of Example 1, the surface of the transparent electrode 2 is subjected to ultraviolet irradiation treatment before the light emitting layer 3 is formed. Other than that, a dispersion type EL element 10 as shown in FIG. In the dispersion type EL element of Example 3, the light emission uniformity was improved. This is considered to be because the lipophilicity of the surface of the transparent electrode 2 is improved by the ultraviolet irradiation treatment, and the adhesion of the light emitting layer 3 formed on the transparent electrode 2 is improved.
上述の実施形態の説明は、すべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上述の実施形態ではなく、特許請求の範囲によって示される。さらに、本発明の範囲には、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The above description of the embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.
１−基板（ベースフィルム）
２−透明電極
３−発光層
４−誘電体層
５−背面電極
６−中間層
６Ａ−バインダー
６Ｂ−誘電体粉末
１０−分散型ＥＬ素子
1-substrate (base film)
2-transparent electrode 3-light emitting layer 4-dielectric layer 5-back electrode 6-intermediate layer 6A-binder 6B-dielectric powder 10-dispersion type EL element
Claims (6)
前記誘電体層が、バインダー中に誘電体粉末を分散してなり、
前記発光層と前記誘電体層との間に、前記発光層表面の凹凸を吸収する中間層であって、バインダー中に誘電体粉末を分散してなる中間層が形成され、
前記中間層中の前記誘電体粉末の混合率は、前記誘電体層のそれに比べて低い分散型ＥＬ素子。 In a dispersion type EL element configured by laminating a transparent electrode formed on a substrate, a light emitting layer, a dielectric layer, and a back electrode,
The dielectric layer is formed by dispersing a dielectric powder in a binder,
Between the light emitting layer and the dielectric layer, an intermediate layer that absorbs irregularities on the surface of the light emitting layer, and an intermediate layer formed by dispersing dielectric powder in a binder is formed ,
A dispersion type EL device in which the mixing ratio of the dielectric powder in the intermediate layer is lower than that of the dielectric layer .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011115334A JP5744621B2 (en) | 2011-05-24 | 2011-05-24 | Dispersion type EL device and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011115334A JP5744621B2 (en) | 2011-05-24 | 2011-05-24 | Dispersion type EL device and manufacturing method thereof |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2012243695A JP2012243695A (en) | 2012-12-10 |
| JP2012243695A5 JP2012243695A5 (en) | 2014-05-08 |
| JP5744621B2 true JP5744621B2 (en) | 2015-07-08 |
Family
ID=47465151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2011115334A Expired - Fee Related JP5744621B2 (en) | 2011-05-24 | 2011-05-24 | Dispersion type EL device and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5744621B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014061118A1 (en) * | 2012-10-17 | 2014-04-24 | タツモ株式会社 | Dispersion-type el element and method for producing same |
| US10109429B2 (en) | 2013-10-04 | 2018-10-23 | Asahi Kasei Kabushiki Kaisha | Solar cell, manufacturing method therefor, semiconductor device, and manufacturing method therefor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3578786B2 (en) * | 1992-12-24 | 2004-10-20 | アイファイアー テクノロジー インク | EL laminated dielectric layer structure, method for producing the dielectric layer structure, laser pattern drawing method, and display panel |
| JP2000082584A (en) * | 1998-09-04 | 2000-03-21 | Nec Kansai Ltd | Electroluminescence lamp |
| JP2006156339A (en) * | 2004-08-31 | 2006-06-15 | Fuji Photo Film Co Ltd | Distributed electroluminescent element |
| JP2008010402A (en) * | 2006-06-02 | 2008-01-17 | Semiconductor Energy Lab Co Ltd | Light-emitting element and display device |
| JP2008251321A (en) * | 2007-03-30 | 2008-10-16 | Kuraray Luminas Co Ltd | Inorganic electroluminescent element, and illumination device equipped with this |
| DE102007030108A1 (en) * | 2007-06-28 | 2009-01-02 | Lyttron Technology Gmbh | Inorganic thick film AC electroluminescent element with at least two feeds and manufacturing process and application |
-
2011
- 2011-05-24 JP JP2011115334A patent/JP5744621B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012243695A (en) | 2012-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0830807B1 (en) | Electroluminescent lamp having a terpolymer binder | |
| US7354785B2 (en) | Electroluminescent light emitting device | |
| JP5744621B2 (en) | Dispersion type EL device and manufacturing method thereof | |
| WO2006093095A1 (en) | Dispersion-type electroluminescent element | |
| JP2005317251A (en) | Light emitting element and display device | |
| JP4533775B2 (en) | Electroluminescent phosphor particles and dispersive electroluminescence device | |
| WO2014061118A1 (en) | Dispersion-type el element and method for producing same | |
| KR101333254B1 (en) | EL device sheet and manufacturing method thereof | |
| JP5647841B2 (en) | Dispersion type EL device manufacturing method | |
| US11259371B2 (en) | Inorganic electroluminescence device and method for manufacturing the same | |
| JP5859005B2 (en) | Dispersion type EL device manufacturing method | |
| JP2009016297A (en) | Inorganic electroluminescent panel | |
| JP2004356043A (en) | El element | |
| JP5824944B2 (en) | Dispersion type inorganic electroluminescence device | |
| KR20050008026A (en) | Manufacturing method for high efficiency Inorganic Electro Luminescent Unit to use of pressurization operation | |
| JPH09232076A (en) | El lamp | |
| JP2011253635A (en) | Inorganic el element and method for manufacturing inorganic el element | |
| JP2012146436A (en) | Dispersion type el element | |
| JP2009105044A (en) | Dispersion type inorganic electroluminescence device and its manufacturing method | |
| JP2012064480A5 (en) | ||
| JP2003281941A (en) | Transparent conductive film and electroluminescent light emitting element using the same | |
| KR101070935B1 (en) | Inorganic electroluminescence device and method of manufacturing the same | |
| JP2000058268A (en) | Organic dispersion el element | |
| JP2011181478A (en) | Distributed inorganic el element and its manufacturing method | |
| JP2004342366A (en) | El element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20140319 |
|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20140319 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20141210 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20141216 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20150216 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20150407 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20150430 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 5744621 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |