JP5589251B2 - 有機エレクトロルミネッセンス素子材料 - Google Patents
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- 0 *c(cc1)cc2c1[s]c1ncccc21 Chemical compound *c(cc1)cc2c1[s]c1ncccc21 0.000 description 15
- PUGVUMGDLOGGRQ-UHFFFAOYSA-N Cc(cc1)cc(C2)c1Sc1c2ccnc1 Chemical compound Cc(cc1)cc(C2)c1Sc1c2ccnc1 PUGVUMGDLOGGRQ-UHFFFAOYSA-N 0.000 description 1
- UEZVGPCDJLUWFP-UHFFFAOYSA-N Cc(cc1)cc2c1Sc1cccnc1S2 Chemical compound Cc(cc1)cc2c1Sc1cccnc1S2 UEZVGPCDJLUWFP-UHFFFAOYSA-N 0.000 description 1
- JZQPHYSBFNLSLW-UHFFFAOYSA-N Cc(cc1)cc2c1c1ccnc(CCCO)c1[s]2 Chemical compound Cc(cc1)cc2c1c1ccnc(CCCO)c1[s]2 JZQPHYSBFNLSLW-UHFFFAOYSA-N 0.000 description 1
- YYQLPGHJVCNRRB-UHFFFAOYSA-N Cc(cc12)ccc1[s]c1c2nccc1 Chemical compound Cc(cc12)ccc1[s]c1c2nccc1 YYQLPGHJVCNRRB-UHFFFAOYSA-N 0.000 description 1
- IYPXSLHVEXIQHS-UHFFFAOYSA-N Cc1cnc2[s]c3ccccc3c2c1 Chemical compound Cc1cnc2[s]c3ccccc3c2c1 IYPXSLHVEXIQHS-UHFFFAOYSA-N 0.000 description 1
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Description
特に、本発明によれば、構成4において、一般式(2)中、Xbは酸素原子または硫黄原子を表し、X 11 、X 12 、X 13 、X 14 は各々炭素原子または窒素原子を表すが、そのいずれか一つは窒素原子であり、X 15 、X 16 、X 17 、X 18 は各々炭素原子を表し、R1、R2は各々ベンゼン環を含む基、カルバゾール環を含む基、ジベンゾフラン環を含む基、またはトリアジン環を含む基を表し、n、mのいずれかは1以上の整数を表す有機エレクトロルミネッセンス素子材料が提供される。
2.前記一般式(1)において、Z3が単なる結合手を表す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材料。
5.前記一般式(2)が下記一般式(3)で表され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材料。
6.前記一般式(2)が下記一般式(4)で表され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材料。
7.前記一般式(2)が下記一般式(5)で表され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材料。
8.前記一般式(2)が下記一般式(6)で表され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材料。
9.前記一般式(1)が下記一般式(7)で表されることを特徴とする前記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材料。
10.ホスト化合物及びリン光性化合物を含有する発光層を有する有機エレクトロルミネッセンス素子であって、該素子を構成するいずれかの層に前記1〜9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材料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。
本発明の有機EL素子材料を用いて本発明の有機EL素子を作製する場合、有機EL素子の構成層(詳細は後述する)の中で、発光層または正孔阻止層に本発明の有機EL素子材料を用いることが好ましい。また、発光層中では上記のようにホスト化合物(発光ホストともいう)として好ましく用いられる。
発光層中の主成分であるホスト化合物である発光ホストに対するリン光性化合物(発光ドーパントともいう)との混合比は、好ましくは質量で0.1〜30質量%未満の範囲に調整することである。
本発明に用いられるホスト化合物とは、発光層に含有される化合物のうちで室温(25℃)においてリン光発光のリン光量子収率が、0.01未満の化合物を表す。
本発明の有機EL素子の構成層について説明する。
(ii)陽極/電子阻止層/発光層/正孔阻止層/電子輸送層/陰極
(iii)陽極/正孔輸送層/電子阻止層/発光層/正孔阻止層/電子輸送層/陰極
(iv)陽極/正孔輸送層/電子阻止層/発光層/正孔阻止層/電子輸送層/陰極
(v)陽極/正孔輸送層/電子阻止層/発光層/正孔阻止層/電子輸送層/陰極バッファー層/陰極
(vi)陽極/陽極バッファー層/正孔輸送層/電子阻止層/発光層/正孔阻止層/電子輸送層/陰極バッファー層/陰極
(vii)陽極/陽極バッファー層/正孔輸送層/電子阻止層/発光層/正孔阻止層/電子輸送層/陰極バッファー層/陰極
《阻止層(電子阻止層、正孔阻止層)》
本発明に係る阻止層(例えば、電子阻止層、正孔阻止層)について説明する。
正孔阻止層とは広い意味では電子輸送層の機能を有し、電子を輸送する機能を有しつつ正孔を輸送する能力が著しく小さい材料からなり、電子を輸送しつつ正孔を阻止することで電子と正孔の再結合確率を向上させることができる。
一方、電子阻止層とは広い意味では正孔輸送層の機能を有し、正孔を輸送する機能を有しつつ電子を輸送する能力が著しく小さい材料からなり、正孔を輸送しつつ電子を阻止することで電子と正孔の再結合確率を向上させることができる。また、後述する正孔輸送層の構成を必要に応じて電子阻止層として用いることができる。
正孔輸送層とは正孔を輸送する機能を有する材料を含み、広い意味で正孔注入層、電子阻止層も正孔輸送層に含まれる。正孔輸送層は単層もしくは複数層設けることができる。
電子輸送層とは電子を輸送する機能を有する材料からなり、広い意味で電子注入層、正孔阻止層も電子輸送層に含まれる。電子輸送層は単層もしくは複数層を設けることができる。
注入層は必要に応じて設け、電子注入層と正孔注入層があり、上記のごとく陽極と発光層または正孔輸送層の間、及び陰極と発光層または電子輸送層との間に存在させてもよい。
本発明の有機EL素子に係る陽極としては、仕事関数の大きい(4eV以上)金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが好ましく用いられる。このような電極物質の具体例としては、Au等の金属、CuI、インジウムチンオキシド(ITO)、SnO2、ZnO等の導電性透明材料が挙げられる。また、IDIXO(In2O3−ZnO)等非晶質で透明導電膜を作製可能な材料を用いてもよい。
一方、本発明に係る陰極としては、仕事関数の小さい(4eV以下)金属(電子注入性金属と称する)、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが用いられる。このような電極物質の具体例としては、ナトリウム、ナトリウム−カリウム合金、マグネシウム、リチウム、マグネシウム/銅混合物、マグネシウム/銀混合物、マグネシウム/アルミニウム混合物、マグネシウム/インジウム混合物、アルミニウム/酸化アルミニウム(Al2O3)混合物、インジウム、リチウム/アルミニウム混合物、希土類金属等が挙げられる。これらの中で、電子注入性及び酸化等に対する耐久性の点から、電子注入性金属とこれより仕事関数の値が大きく安定な金属である第二金属との混合物、例えば、マグネシウム/銀混合物、マグネシウム/アルミニウム混合物、マグネシウム/インジウム混合物、アルミニウム/酸化アルミニウム(Al2O3)混合物、リチウム/アルミニウム混合物、アルミニウム等が好適である。
本発明の有機EL素子に係る基体としては、ガラス、プラスチック等の種類には特に限定はなく、また透明のものであれば特に制限はないが、好ましく用いられる基板としては、例えば、ガラス、石英、光透過性樹脂フィルムを挙げることができる。特に好ましい基体は、有機EL素子にフレキシブル性を与えることが可能な樹脂フィルムである。
本発明の有機EL素子の作製方法の一例として、陽極/正孔注入層/正孔輸送層/発光層/正孔阻止層/電子輸送層/陰極バッファー層/陰極からなる有機EL素子の作製法について説明する。
本発明の表示装置について説明する。本発明の表示装置は上記有機EL素子を有する。
本発明の照明装置について説明する。本発明の照明装置は上記有機EL素子を有する。
《有機EL素子1−1の作製》
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iso−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5つのタンタル製抵抗加熱ボートにα−NPD、H4、Ir−12、BAlq、Alq3をそれぞれ入れ、真空蒸着装置(第1真空槽)に取り付けた。
有機EL素子1−1の作製において、ホスト化合物のH4を表1に記載のホスト化合物に変更した以外は同様にして、有機EL素子1−2〜1−16を作製した。
得られた有機EL素子1−1〜1−16を評価するに際しては、作製後の各有機EL素子の非発光面をガラスケースで覆い、厚み300μmのガラス基板を封止用基板として用いて、周囲にシール材として、エポキシ系光硬化型接着剤(東亞合成社製ラックストラックLC0629B)を適用し、これを上記陰極上に重ねて前記透明支持基板と密着させ、ガラス基板側からUV光を照射して、硬化させて、封止して、図5、図6に示すような照明装置を形成して評価した。
有機EL素子を室温(約23〜25℃)、2.5mA/cm2の定電流条件下による点灯を行い、点灯開始直後の発光輝度(L)[cd/m2]を測定することにより、外部取り出し量子効率(η)を算出した。ここで、発光輝度の測定はCS−1000(コニカミノルタセンシング製)を用いた。外部取り出し量子効率は有機EL素子1−1を100とする相対値で表した。
有機EL素子を室温下、2.5mA/cm2の定電流条件下による連続点灯を行い、初期輝度の半分の輝度になるのに要する時間(τ1/2)を測定した。発光寿命は有機EL素子1−1を100と設定する相対値で表した。
《有機EL素子2−1の作製》
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iso−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5つのタンタル製抵抗加熱ボートにα−NPD、H4、Ir−1、BAlq、Alq3をそれぞれ入れ、真空蒸着装置(第1真空槽)に取り付けた。
有機EL素子2−1の作製において、正孔阻止化合物のBAlqを表2に記載の正孔阻止化合物に変更した以外は同様にして、有機EL素子2−2〜2−9を作製した。
実施例1と同様の評価を行った。得られた結果を表10に示す。
《フルカラー表示装置の作製》
(青色発光素子の作製)
実施例1の有機EL素子1−11を青色発光素子として用いた。
実施例2の有機EL素子2−2を緑色発光素子として用いた。
実施例2の有機EL素子2−2において、Ir−1をIr−9に変更した以外は同様にして、赤色発光素子を作製し、これを赤色発光素子として用いた。
《白色発光素子及び白色照明装置の作製−1》
実施例1の透明電極基板の電極を20mm×20mmにパターニングし、その上に実施例1と同様に正孔注入/輸送層としてα−NPDを25nmの厚さで成膜し、更に化合物12の入った前記加熱ボートと例示化合物Ir−13の入ったボート及びIr−9の入ったボートをそれぞれ独立に通電して、発光ホストである化合物12と発光ドーパントであるIr−13及びIr−9の蒸着速度が100:5:0.6になるように調節し、膜厚30nmの厚さになるように蒸着し、発光層を設けた。
《白色発光素子及び白色照明装置の作製−2》
陽極として100mm×100mm×1.1mmのガラス基板上にITO(インジウムチンオキシド)を100nm製膜した基板(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。
《有機EL素子6−1〜6−5の作製》
陽極として100mm×100mm×1.1mmのガラス基板上にITO(インジウムチンオキシド)を100nm製膜した基板(NHテクノグラス社製NA45)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。
以下のようにして作製した有機EL素子6−1〜6−5の評価を行い、その結果を表9に示す。
作製した有機EL素子について、23℃、乾燥窒素ガス雰囲気下で2.5mA/cm2定電流を印加した時の外部取り出し量子効率(%)を測定した。なお測定には同様に分光放射輝度計CS−1000(コニカミノルタセンシング製)を用いた。
3 画素
5 走査線
6 データ線
7 電源ライン
10 有機EL素子
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
B 制御部
102 ガラスカバー
105 陰極
106 有機EL層
107 透明電極付きガラス基板
108 窒素ガス
109 捕水剤
Claims (6)
- 前記一般式(2−1)中、R1、R2は各々ベンゼン環を含む二価基、ベンゼン環を含む三価基、カルバゾール環を含む二価基、ジベンゾフラン環を含む二価基、またはトリアジン環を含む三価基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材料。
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TWI373506B (en) * | 2004-05-21 | 2012-10-01 | Toray Industries | Light-emitting element material and light-emitting material |
JP5018043B2 (ja) * | 2005-12-01 | 2012-09-05 | 住友化学株式会社 | 高分子化合物およびそれを用いた高分子発光素子 |
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