JP5321710B2 - 有機エレクトロルミネッセンス素子及び表示装置 - Google Patents
有機エレクトロルミネッセンス素子及び表示装置 Download PDFInfo
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- JP5321710B2 JP5321710B2 JP2012087083A JP2012087083A JP5321710B2 JP 5321710 B2 JP5321710 B2 JP 5321710B2 JP 2012087083 A JP2012087083 A JP 2012087083A JP 2012087083 A JP2012087083 A JP 2012087083A JP 5321710 B2 JP5321710 B2 JP 5321710B2
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- YYMBJDOZVAITBP-UHFFFAOYSA-N rubrene Chemical compound C1=CC=CC=C1C(C1=C(C=2C=CC=CC=2)C2=CC=CC=C2C(C=2C=CC=CC=2)=C11)=C(C=CC=C2)C2=C1C1=CC=CC=C1 YYMBJDOZVAITBP-UHFFFAOYSA-N 0.000 description 1
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- IBBLKSWSCDAPIF-UHFFFAOYSA-N thiopyran Chemical compound S1C=CC=C=C1 IBBLKSWSCDAPIF-UHFFFAOYSA-N 0.000 description 1
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Description
(2)前記化合物の分子量が550〜2000であることを特徴とする前記(1)に記
載の有機エレクトロルミネッセンス素子。
2.下記一般式(4)で表される化合物の少なくとも1種を含有することを特徴とする有機エレクトロルミネッセンス素子。
3.下記一般式(5)で示される化合物の少なくとも1種を含有することを特徴とする有機エレクトロルミネッセンス素子。
4.ピリジン、ピラジン、ピリミジン、ピリダジン、チオフェン、フランおよびピロールを部分構造として有する芳香族複素環基が置換した芳香族炭化水素基が、置換または無置換のフェニル基であることを特徴とする前記3に記載の有機エレクトロルミネッセンス素子。
以下に一般式(1a)、一般式(1)〜(5)で表される化合物例の具体例を示すが、I−1、I−3〜7が本発明に係る化合物の例である。本発明の化合物はこれらに限定されるものではない。
以下に本発明に好ましく使用される無機系蛍光体を示すが、本発明はこれらの化合物に限定されるものではない。
(BL−1) Sr2P2O7:Sn4+
(BL−2) Sr4Al14O25:Eu2+
(BL−3) BaMgAl10O17:Eu2+
(BL−4) SrGa2S4:Ce3+
(BL−5) CaGa2S4:Ce3+
(BL−6) (Ba、Sr)(Mg、Mn)Al10O17:Eu2+
(BL−7) (Sr、Ca、Ba、Mg)10(PO4)6Cl2:Eu2+
(BL−8) BaAl2SiO8:Eu2+
(BL−9) Sr2P2O7:Eu2+
(BL−10) Sr5(PO4)3Cl:Eu2+
(BL−11) (Sr、Ca、Ba)5(PO4)3Cl:Eu2+
(BL−12) BaMg2Al16O27:Eu2+
(BL−13) (Ba、Ca)5(PO4)3Cl:Eu2+
(BL−14) Ba3MgSi2O8:Eu2+
(BL−15) Sr3MgSi2O8:Eu2+
[緑色発光 無機系蛍光体]
(GL−1) (BaMg)Al16O27:Eu2+,Mn2+
(GL−2) Sr4Al14O25:Eu2+
(GL−3) (SrBa)Al2Si2O8:Eu2+
(GL−4) (BaMg)2SiO4:Eu2+
(GL−5) Y2SiO5:Ce3+,Tb3+
(GL−6) Sr2P2O7−Sr2B2O5:Eu2+
(GL−7) (BaCaMg)5(PO4)3Cl:Eu2+
(GL−8) Sr2Si3O8−2SrCl2:Eu2+
(GL−9) Zr2SiO4,MgAl11O19:Ce3+,Tb3+
(GL−10) Ba2SiO4:Eu2+
(GL−11) Sr2SiO4:Eu2+
(GL−12) (BaSr)SiO4:Eu2+
[赤色発光 無機系蛍光体]
(RL−1) Y2O2S:Eu3+
(RL−2) YAlO3:Eu3+
(RL−3) Ca2Y2(SiO4)6:Eu3+
(RL−4) LiY9(SiO4)6O2:Eu3+
(RL−5) YVO4:Eu3+
(RL−6) CaS:Eu3+
(RL−7) Gd2O3:Eu3+
(RL−8) Gd2O2S:Eu3+
(RL−9) Y(P、V)O4:Eu3+
(RL−10) Mg4GeO5.5F:Mn4+
(RL−11) Mg4GeO6:Mn4+
(RL−12) K5Eu2.5(WO4)6.25
(RL−13) Na5Eu2.5(WO4)6.25
(RL−14) K5Eu2.5(MoO4)6.25
(RL−15) Na5Eu2.5(MoO4)6.25
上記無機系蛍光体は、必要に応じて表面改質処理を施してもよく、その方法としてはシランカップリング剤等の化学的処理によるものや、サブミクロンオーダーの微粒子等の添加による物理的処理によるもの、さらにはそれらの併用によるもの等が挙げられる。
(式中、Lx、Ly、Lzはそれぞれ独立に2個以上の結合手を持つ原子を表し、nは0または1を表し、XaはLxの隣接位にあって前記希土類金属に配位可能な原子を有する置換基を表し、YaはLzの隣接位にあってやはり前記希土類金属に配位可能な原子を有する置換基を表す。さらにXaの任意の部分とLxとは互いに縮合して環を形成してもよく、Yaの任意の部分とLzとは互いに縮合して環を形成してもよく、LxとLzとは互いに縮合して環を形成してもよく、さらに分子内に芳香族炭化水素環または芳香族複素環が少なくとも一つ存在する。ただし、Xa−(Lx)−(Ly)n−(Lz)−Yaがβ−ジケトン誘導体やβ−ケトエステル誘導体、β−ケトアミド誘導体又は前記ケトンの酸素原子を硫黄原子又は−N(R201)−に置き換えたもの、クラウンエーテルやアザクラウンエーテルまたはチアクラウンエーテルまたはクラウンエーテルの酸素原子を任意の数硫黄原子または−N(R201)−に置き換えたクラウンエーテルを表す場合には芳香族炭化水素環または芳香族複素環は無くてもよい。−N(R201)−において、R201は、水素原子、置換または無置換のアルキル基、置換または無置換のアリール基を表す。)
一般式(B)において、XaおよびYaで表される配位可能な原子とは、具体的には酸素原子、窒素原子、硫黄原子、セレン原子、テルル原子であり、特に酸素原子、窒素原子、硫黄原子であることが好ましい。
(電子輸送材料)
陽極としてガラス上にITOを150nm成膜した基板(NHテクノグラス社製:NA−45)にパターニングを行った後、このITO透明電極を設けた透明支持基板をイソプロピルアルコールで超音波洗浄し、乾燥窒素ガスで乾燥し、UVオゾン洗浄を5分間行った。この透明支持基板を、市販の真空蒸着装置の基板ホルダーに固定し、一方、モリブデン製抵抗加熱ボートに、m−MTDATAを200mg入れ、別のモリブデン製抵抗加熱ボートにDPVBiを200mg入れ、また別のモリブデン製抵抗加熱ボートにBCを200mg入れ真空蒸着装置に取付けた。
実施例1で作製した有機エレクトロルミネッセンス素子OLED1−10の陰極をAlに置き換え、電子輸送層と陰極の間にフッ化リチウムを膜厚0.5nm蒸着して陰極バッファー層として設けた以外は同様にして有機エレクトロルミネッセンス素子(OLED2−1)を作製した。
実施例1で用いた有機エレクトロルミネッセンス素子の発光層をDPVBiからそれぞれAlq3またはAlq3とDCM2を100:1の質量比で蒸着した発光層に置き替えた以外は同様にして、有機エレクトロルミネッセンス素子を作製した。
実施例1および3で作製したそれぞれ赤色、緑色、青色発光有機エレクトロルミネッセンス素子を同一基板上に並置し、図1〜図3で示したアクティブマトリクス方式フルカラー表示装置を作製した。該フルカラー表示装置を駆動することにより、輝度の高い鮮明なフルカラー動画表示が得られた。
陽極としてガラス上にITOを150nm成膜した基板(NHテクノグラス社製:NA−45)にパターニングを行った後、このITO透明電極を設けた透明支持基板をイソプロピルアルコールで超音波洗浄し、乾燥窒素ガスで乾燥し、UVオゾン洗浄を5分間行った。この透明支持基板を、市販の真空蒸着装置の基板ホルダーに固定し、一方、モリブデン製抵抗加熱ボートに、m−MTDATAを200mg入れ、別のモリブデン製抵抗加熱ボートにN,N′−ジフェニル−N,N′−ビス(3−メチルフェニル)[1,1′−ビフェニル]−4,4′−ジアミン(TPD)を200mg入れ、また別のモリブデン製抵抗加熱ボートにBCを200mg入れ、さらに他のモリブデン製抵抗加熱ボートに下記比較化合物3を200mg入れ真空蒸着装置に取付けた。
化合物I−10とDCM2を100:1の質量比で蒸着した膜厚30nmの発光層を使用する以外は、実施例5と同様の方法で有機エレクトロルミネッセンス素子OLED6−1を作製した。
実施例1で作製した有機エレクトロルミネッセンス素子OLED1−10の、正孔輸送材料をm−MTDATXA、発光層の有機化合物をBP−13、陰極をAl、電子輸送層と陰極の間にフッ化リチウムを膜厚0.5nm蒸着して陰極バッファー層として設けた以外は、同様の方法により、有機エレクトロルミネッセンス素子(OLED7−1)を作製した。
平均粒径5nmのエアロジル0.16gにエタノール15g及びγ−グリシドキシプロピルトリエトキシシラン0.22gを加えて開放系室温下1時間攪拌した。この混合物と無機蛍光体RL−12を20g乳鉢に移し、よくすり混ぜた後、70℃のオーブンで2時間、さらに120℃のオーブンで2時間加熱し、表面改質した無機蛍光体RL−12を得た。
(フルカラー表示装置)
図2の複数の画素3を有する表示部Aにおいて、複数の画素3が備えている複数の有機エレクトロルミネッセンス素子をすべて、参考例7に記載の有機エレクトロルミネッセンス素子(OLED7−1)とした表示装置を作製した。この時点で表示装置に電圧を印加すると、すべての画素3から青紫色の発光が得られた。
3 画素
5 走査線
6 データ線
7 電源ライン
10 有機エレクトロルミネッセンス素子
10a 陰極
10b 有機化合物薄膜
10c 透明電極
10d 透明基板
10e 色変換層
11 スイッチングトランジスタ
12 駆動トランジスタ
13 コンデンサ
A 表示部(ディスプレイ)
B 制御部
X 色変換部
Y 有機EL部
Claims (8)
- 前記化合物の分子量が550〜2000であることを特徴とする請求項1に記載の有機エレクトロルミネッセンス素子。
- 前記化合物を、電子輸送層に含有することを特徴とする請求項1または2に記載の有機エレクトロルミネッセンス素子。
- 電子を注入する陰極と前記化合物を含有する層の間に、陰極バッファー層を有することを特徴とする請求項1〜3のいずれか1項に記載の有機エレクトロルミネッセンス素子。
- 請求項1〜4のいずれか1項に記載の有機エレクトロルミネッセンス素子を有することを特徴とする表示装置。
- 異なる極大発光波長を有する請求項1〜4のいずれか1項に記載の有機エレクトロルミネッセンス素子の2種以上を同一基板上に並置したことを特徴とする表示装置。
- 請求項1〜4のいずれか1項に記載の有機エレクトロルミネッセンス素子及びその発光を吸収してそれとは異なる極大波長で発光する変換層を有することを特徴とする表示装置。
- 極大発光波長の異なる変換層の2種以上が同一基板上に並置されていることを特徴とする請求項7に記載の表示装置。
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