JP2013012303A - Organic el lighting device - Google Patents

Organic el lighting device Download PDF

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JP2013012303A
JP2013012303A JP2011142429A JP2011142429A JP2013012303A JP 2013012303 A JP2013012303 A JP 2013012303A JP 2011142429 A JP2011142429 A JP 2011142429A JP 2011142429 A JP2011142429 A JP 2011142429A JP 2013012303 A JP2013012303 A JP 2013012303A
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JP5803334B2 (en
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Yukio Matsumoto
行生 松本
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Nippon Seiki Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an organic EL lighting device which has a high uniformity ratio.SOLUTION: An organic EL lighting device includes at least a first electrode 2, an organic layer 4, and a second electrode 3. The organic layer 4 is held by an anode part 2a of the first electrode 2 and a cathode part 3a of the second electrode 3. The second electrode 3 has an electron application part 3c which is narrower than the cathode part 3a. A width W4 of the electron application part 3c is less than half the width W1 of a hole application part 2c of the first electrode 2. A low resistance wiring part 7 is formed on an anode wiring part 2b of the first electrode 2.

Description

本発明は、面状に発光する有機ＥＬ照明装置に関するものである。   The present invention relates to an organic EL lighting device that emits light in a planar shape.

近年、有機ＥＬ表示装置及び有機ＥＬ照明装置に用いられる有機ＥＬ素子が自発光素子として脚光を浴びている。有機ＥＬ表示装置は、液晶表示装置に比して、視野角依存性が少ない、コントラスト比が高い、薄膜化が可能である等の利点から、各所で次世代のフラットパネルディスプレイとして研究開発が行われている。また、有機ＥＬ照明装置の開発も進んでおり、例えば特許文献１に開示されている。有機ＥＬ照明装置の特徴として、発光ダイオード等の点光源と違い、面光源であることから、高い期待が寄せられている。   In recent years, organic EL elements used in organic EL display devices and organic EL lighting devices have been spotlighted as self-luminous elements. Organic EL display devices are being researched and developed as next-generation flat panel displays in various places because of their advantages such as less viewing angle dependency, high contrast ratio, and thin film thickness compared to liquid crystal display devices. It has been broken. In addition, the development of organic EL lighting devices is also progressing, and is disclosed in Patent Document 1, for example. A feature of the organic EL lighting device is that it is a surface light source unlike a point light source such as a light emitting diode, and therefore, high expectations are placed on it.

特開２０１０−１９８９８０号公報JP 2010-198980 A

しかしながら、有機ＥＬ照明装置の発光面内において、輝度の高い箇所と、低い箇所とが発生する虞があった。有機ＥＬ照明装置は、面光源であることから、発光面内の発光輝度のバラつきを示す均斉度が重要視されているが、この均斉度が低い場合、発光面内での温度バラつきにも影響を及ぼすことがあるため、問題であった。
本発明は、この問題に鑑みなされたものであり、均斉度が高い有機ＥＬ照明装置を提供するものである。 However, in the light emitting surface of the organic EL lighting device, there is a possibility that a location with high brightness and a location with low brightness may occur. Since the organic EL lighting device is a surface light source, the degree of uniformity indicating the variation in emission luminance within the light emitting surface is regarded as important. However, if this degree of uniformity is low, the temperature variation within the light emitting surface is also affected. It was a problem.
The present invention has been made in view of this problem, and provides an organic EL lighting device having high uniformity.

本発明は、請求項１に記載したように、少なくとも第一電極２と有機層４と第二電極３とを備え、前記有機層４は前記第一電極２の陽極部２ａと前記第二電極３の陰極部３ａとによって挟持されてなる有機ＥＬ照明装置であって、前記第二電極は３、前記陰極部３ａよりも幅狭な電子印加部３ｃを有するものである。   As described in claim 1, the present invention includes at least a first electrode 2, an organic layer 4, and a second electrode 3, and the organic layer 4 includes the anode portion 2 a of the first electrode 2 and the second electrode. The organic EL lighting device is sandwiched between three cathode portions 3a, and the second electrode has an electron application portion 3c that is narrower than the cathode portion 3a.

また、本発明は、請求項２に記載したように、前記電子印加部３ｃの幅Ｗ４は、前記第一電極２の正孔印加部２ｃの幅Ｗ１の半分以下であるものである。   In the present invention, as described in claim 2, the width W4 of the electron application section 3c is less than or equal to half of the width W1 of the hole application section 2c of the first electrode 2.

また、本発明は、請求項３に記載したように、前記第一電極２の陽極配線部２ｂ上に形成された低抵抗配線部７を備えたものである。   Further, according to the present invention, the low resistance wiring portion 7 formed on the anode wiring portion 2b of the first electrode 2 is provided.

電子印加部を陰極部よりも幅狭にしたことにより、有機ＥＬ照明装置の均斉度が良好になる。   By making the electron application part narrower than the cathode part, the uniformity of the organic EL lighting device is improved.

本発明の実施形態を示す有機ＥＬパネルＡの正面図。The front view of the organic electroluminescent panel A which shows embodiment of this invention. 同上実施形態を示す正面図。The front view which shows embodiment same as the above. 同上実施形態を示す正面図。The front view which shows embodiment same as the above. 同上実施形態を示す正面図。The front view which shows embodiment same as the above. 第一比較例を示す有機ＥＬパネルＢの正面図。The front view of organic electroluminescent panel B which shows a 1st comparative example. 第二比較例を示す有機ＥＬパネルＣの正面図。The front view of the organic electroluminescent panel C which shows a 2nd comparative example. 有機ＥＬパネルＡ，Ｂ，Ｃの輝度値を示す表図。The table which shows the luminance value of organic electroluminescent panel A, B, C. FIG.

以下、添付の図面に基づいて、ボトムエミッション方式の有機ＥＬパネルＡに本発明を適用した一実施形態を説明する。有機ＥＬパネルＡは、基板１，第一電極２，第二電極３，発光部（有機層）４，低抵抗配線部７を備えている。   Hereinafter, an embodiment in which the present invention is applied to a bottom emission type organic EL panel A will be described with reference to the accompanying drawings. The organic EL panel A includes a substrate 1, a first electrode 2, a second electrode 3, a light emitting part (organic layer) 4, and a low resistance wiring part 7.

基板１は、矩形のガラス板からなるものである。基板１は、０．７ｍｍ厚の無アルカリガラスからなるものであるが、他のガラス基板（アルカリガラス等）を用いても構わない。また、ガラス厚についても、その他のガラス厚のものを用いても構わない。   The substrate 1 is made of a rectangular glass plate. The substrate 1 is made of non-alkali glass having a thickness of 0.7 mm, but other glass substrates (alkali glass or the like) may be used. Further, the glass thickness may be other glass thickness.

第一電極２は、スパッタリング法にて基板１に形成されたＩＴＯ（Indium Tin Oxide）からなるものである。第一電極２は、ＩＴＯでなくても良く、ＩＺＯ（Indium Zinc Oxide）或いはＡＺＯ（Aluminum
Zinc Oxide）等であっても構わない。第一電極２は、陽極部２ａ及び陽極配線部２ｂを有している（図２参照）。第一電極２の陽極部２ａは、発光部４が形成される矩形領域である。第一電極２の陽極配線部２ｂは、発光部４に正孔を印加する正孔印加部２ｃを有しており、この正孔印加部２ｃは所定幅Ｗ１を有している。 The first electrode 2 is made of ITO (Indium Tin Oxide) formed on the substrate 1 by a sputtering method. The first electrode 2 may not be ITO, but may be IZO (Indium Zinc Oxide) or AZO (Aluminum).
Zinc Oxide) or the like. The 1st electrode 2 has the anode part 2a and the anode wiring part 2b (refer FIG. 2). The anode part 2a of the first electrode 2 is a rectangular area in which the light emitting part 4 is formed. The anode wiring portion 2b of the first electrode 2 has a hole applying portion 2c that applies holes to the light emitting portion 4, and the hole applying portion 2c has a predetermined width W1.

発光部４は、正孔注入層，正孔輸送層，発光層，電子輸送層，電子注入層を順次積層した有機膜層からなるものである。発光部４は、横幅Ｗ２，縦幅Ｗ３の矩形になっており、第一電極２の陽極部２ａ上に形成される（図３参照）。低抵抗配線部７は、モリブデン（Ｍｏ），アルミニウム（Ａｌ），モリブデン（Ｍｏ）の３層構造になっているが、クロム（Ｃｒ）配線等の低抵抗配線であっても構わない。低抵抗配線部７は、第一電極２の陽極配線部２ｂ上に形成されている。   The light emitting section 4 is composed of an organic film layer in which a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer are sequentially laminated. The light emitting unit 4 has a rectangular shape with a width W2 and a width W3, and is formed on the anode 2a of the first electrode 2 (see FIG. 3). The low resistance wiring portion 7 has a three-layer structure of molybdenum (Mo), aluminum (Al), and molybdenum (Mo), but may be a low resistance wiring such as a chromium (Cr) wiring. The low resistance wiring part 7 is formed on the anode wiring part 2 b of the first electrode 2.

第二電極３は、蒸着法にて形成されたアルミニウム層からなるものである。第二電極３は、陰極部３ａ及び陰極配線部３ｂを有している（図４参照）。第二電極３は、アルミニウム（Ａｌ）からなるものであるが、マグネシウム（Ｍｇ），コバルト（Ｃｏ），金（Ａｕ），銅（Ｃｕ），亜鉛（Ｚｕ）等の金属や、それらの合金を用いても構わない。陰極配線部３ｂは、所定幅Ｗ４を有する電子印加部３ｃを有している。   The second electrode 3 is made of an aluminum layer formed by a vapor deposition method. The second electrode 3 has a cathode portion 3a and a cathode wiring portion 3b (see FIG. 4). The second electrode 3 is made of aluminum (Al). However, a metal such as magnesium (Mg), cobalt (Co), gold (Au), copper (Cu), zinc (Zu), or an alloy thereof is used. You may use. The cathode wiring part 3b has an electron application part 3c having a predetermined width W4.

有機ＥＬパネルＡは、封止部材（図示しない）を備えている。封止部材は、１．１ｍｍ厚の板状の基材をサンドブラスト法によって０．５ｍｍ削って凹部を形成したものである。封止部材は、ＵＶ硬化型の接着剤にて、基板１に接着されている。封止部材は、アルカリガラスからなるものであるが、他のガラス基板や、ステンレス等の金属からなるものであっても構わない。また、凹部の形成方法は、ドライエッチング等のその他掘削手法を用いても構わない。封止部材の凹部には、酸化ストロンチウム（ＳｒＯ）タイプのシート吸湿剤を設置し、水分対策を行っている。なお、酸化ストロンチウムタイプ以外の酸化カルシウム（ＣａＯ）タイプや、酸化バリウム（ＢａＯ）タイプであっても構わない。   The organic EL panel A includes a sealing member (not shown). The sealing member is formed by cutting a plate-like base material having a thickness of 1.1 mm by 0.5 mm by sandblasting to form a recess. The sealing member is bonded to the substrate 1 with a UV curable adhesive. The sealing member is made of alkali glass, but may be made of another glass substrate or a metal such as stainless steel. Moreover, you may use the other excavation methods, such as dry etching, as the formation method of a recessed part. A strontium oxide (SrO) type sheet hygroscopic agent is installed in the recess of the sealing member to take measures against moisture. A calcium oxide (CaO) type other than the strontium oxide type or a barium oxide (BaO) type may be used.

図５は、第一比較例を示すものである。有機ＥＬパネルＢは、基板１，第一電極２，第二電極１３，発光部４を備えている。   FIG. 5 shows a first comparative example. The organic EL panel B includes a substrate 1, a first electrode 2, a second electrode 13, and a light emitting unit 4.

有機ＥＬパネルＢの基板１，第一電極２，発光部４は、有機ＥＬパネルＡと同一である。有機ＥＬパネルＢの第二電極１３は、矩形になっている。有機ＥＬパネルＢは、有機ＥＬパネルＡとは異なり、低抵抗配線部７を備えていない。   The substrate 1, the first electrode 2, and the light emitting unit 4 of the organic EL panel B are the same as those of the organic EL panel A. The second electrode 13 of the organic EL panel B is rectangular. Unlike the organic EL panel A, the organic EL panel B does not include the low resistance wiring portion 7.

図６は、第二比較例を示すものである。有機ＥＬパネルＣは、基板１，第一電極２，第二電極１３，発光部４，低抵抗配線部７を備えている。   FIG. 6 shows a second comparative example. The organic EL panel C includes a substrate 1, a first electrode 2, a second electrode 13, a light emitting unit 4, and a low resistance wiring unit 7.

基板１，第一電極２，第二電極１３，発光部４は、有機ＥＬパネルＢと同一である。低抵抗配線部７は、有機ＥＬパネルＡと同一である。   The substrate 1, the first electrode 2, the second electrode 13, and the light emitting unit 4 are the same as the organic EL panel B. The low resistance wiring portion 7 is the same as the organic EL panel A.

図７は、有機ＥＬパネルＡ，Ｂ，Ｃの所定位置［１］〜［９］における発光輝度を示すものである。有機ＥＬパネルＡ，Ｂ，Ｃは、位置［５］における初期輝度を約３０００ｃｄ／ｍ２として、直流駆動により発光部４が有機発光される。
なお、本明細書における所定位置［１］〜［９］とは、図１，図５，図６における丸１〜丸９を示している。 FIG. 7 shows the light emission luminance at predetermined positions [1] to [9] of the organic EL panels A, B, and C. In the organic EL panels A, B, and C, the initial luminance at the position [5] is about 3000 cd / m 2 , and the light emitting unit 4 emits organic light by direct current driving.
In addition, the predetermined positions [1] to [9] in the present specification indicate the circles 1 to 9 in FIGS.

第一比較例では、隅箇所（位置［１］，［３］，［７］，［９］）における輝度が６０００ｃｄ／ｍ２以上あり、中央箇所（位置［５］）の２倍以上になっている。第二比較例では、低抵抗配線部７があるため、第一比較例に比べると、輝度差が小さくなっている。しかし、隅箇所（位置［１］，［３］，［７］，［９］）における輝度が４５００ｃｄ／ｍ２以上あり、中央箇所（位置［５］）の１．５倍以上になっている。 In the first comparative example, the luminance at the corners (positions [1], [3], [7], [9]) is 6000 cd / m 2 or more, which is twice or more the central part (position [5]). ing. In the second comparative example, since there is the low resistance wiring portion 7, the luminance difference is smaller than that in the first comparative example. However, the luminance at corners (positions [1], [3], [7], [9]) is 4500 cd / m 2 or more, which is 1.5 times or more that at the center (position [5]). .

このように、有機ＥＬパネルＢ，Ｃに輝度ムラが発生するのは、陽極配線部２ｂからの電流の流れ込みによる発熱が原因であると考えられる。つまり、発熱によって、低抵抗化した陽極配線部２ｂに電流が集中してしまい、高輝度発光する個所と、低輝度発光する箇所に分かれてしまい、有機ＥＬパネルＢ，Ｃの発光ムラとなっていると考えられる。   Thus, it is considered that the luminance unevenness occurs in the organic EL panels B and C due to heat generation due to the flow of current from the anode wiring portion 2b. That is, due to heat generation, the current concentrates on the anode wiring portion 2b whose resistance is reduced, and the current is divided into a portion that emits light with high luminance and a portion that emits light with low luminance, resulting in uneven emission of the organic EL panels B and C. It is thought that there is.

本実施形態の有機ＥＬパネルＡでは、陰極配線部３ｂに幅狭部３ｃを設けているため、第一比較例，第二比較例に比べると、輝度ムラが小さい。本実施形態では、陰極配線部３ｂの幅狭部３ｃに温度上昇が発生しており、この温度上昇が有機ＥＬパネルＡの輝度安定性に寄与していると考えられる。つまり、第一比較例，第二比較例のように陽極配線部２ｂ側に発生した高輝度化を、陰極配線部３ｂ側へも発生させることによって、有機ＥＬパネルＡの輝度の均一化を図っている。   In the organic EL panel A of the present embodiment, since the narrow portion 3c is provided in the cathode wiring portion 3b, the luminance unevenness is small as compared with the first comparative example and the second comparative example. In this embodiment, a temperature rise occurs in the narrow portion 3c of the cathode wiring portion 3b, and this temperature rise is considered to contribute to the luminance stability of the organic EL panel A. In other words, the luminance of the organic EL panel A is made uniform by generating the high luminance generated on the anode wiring portion 2b side as in the first comparative example and the second comparative example also on the cathode wiring portion 3b side. ing.

有機ＥＬパネルＢ，Ｃの輝度ムラの原因は、陽極配線部２ｂ側の発熱であるが、本実施形態では、陰極配線部３ｂ側も発熱させることによって、有機ＥＬパネルＡの外周部全体から比較的安定な発熱が生じる。有機ＥＬパネルＡ，Ｂ，Ｃの外周部は、熱の逃げ場とのなるため、比較的放熱され易く、中央部は、熱が逃げにくい傾向がある。この傾向から、外周部は冷却され、中央部は、冷却されにくいため、有機ＥＬパネルＡ全体で熱的に安定になりやすく、また輝度も安定しやすいものと考えられる。電子印加部３ｃの幅Ｗ４は、第一電極２の正孔印加部２ｃＷ１の幅の半分以下であることが望ましい。   The cause of the luminance unevenness of the organic EL panels B and C is the heat generation on the anode wiring portion 2b side. In the present embodiment, the cathode wiring portion 3b side is also heated to compare the entire outer peripheral portion of the organic EL panel A. Stable heat generation occurs. Since the outer peripheral portions of the organic EL panels A, B, and C serve as a heat escape place, heat is relatively easily radiated, and the central portion tends to be difficult for heat to escape. From this tendency, since the outer peripheral portion is cooled and the central portion is hardly cooled, the organic EL panel A as a whole is likely to be thermally stable and the luminance is also likely to be stable. The width W4 of the electron application unit 3c is preferably less than or equal to half the width of the hole application unit 2cW1 of the first electrode 2.

なお、本実施形態の有機ＥＬパネルＡは、ボトムエミッション方式であったが、トップエミッション方式であっても良い。   In addition, although the organic EL panel A of this embodiment was a bottom emission system, it may be a top emission system.

２ 第一電極
２ａ 陽極部
２ｃ 正孔印加部
３ 第二電極
３ａ 陰極部
３ｃ 電子印加部
４ 有機層（発光部）
７ 低抵抗配線部
2 1st electrode 2a Anode part 2c Hole application part 3 Second electrode 3a Cathode part 3c Electron application part 4 Organic layer (light emitting part)
7 Low resistance wiring

Claims (3)

少なくとも第一電極と有機層と第二電極とを備え、前記有機層は前記第一電極の陽極部と前記第二電極の陰極部とによって挟持されてなる有機ＥＬ照明装置であって、
前記第二電極は、前記陰極部よりも幅狭な電子印加部を有することを特徴とする有機ＥＬ照明装置。 An organic EL lighting device comprising at least a first electrode, an organic layer, and a second electrode, wherein the organic layer is sandwiched between an anode portion of the first electrode and a cathode portion of the second electrode,
The organic EL lighting device, wherein the second electrode has an electron application section that is narrower than the cathode section. 前記電子印加部の幅は、前記第一電極の正孔印加部の幅の半分以下であることを特徴とする請求項１に記載の有機ＥＬ照明装置。   2. The organic EL lighting device according to claim 1, wherein a width of the electron application unit is not more than half of a width of a hole application unit of the first electrode. 前記第一電極の陽極配線部上に形成された低抵抗配線部を備えたことを特徴とする請求項１に記載の有機ＥＬ照明装置。   The organic EL lighting device according to claim 1, further comprising a low resistance wiring portion formed on the anode wiring portion of the first electrode.
JP2011142429A 2011-06-28 2011-06-28 Organic EL lighting device Expired - Fee Related JP5803334B2 (en)

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* Cited by examiner, † Cited by third party
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