パルフローロカルボニルで置換されたイリジウム複合体からの深青の光
Sunghun Lee1, Seul-Ong Kim, Hyun Shin
1WCU Hybrid Materials Program, Department of Materials Science and Engineering and the Center for Organic Light Emitting Diode, Seoul National University , Seoul 151-744, South Korea.
Journal of the American Chemical Society
|September 4, 2013
まとめ
新しい深青のイリジウム (III) 複合体は,有機発光ダイオード (OLED) のために合成されました. 複合体は,高光発光量子収量と深青の放射を呈し,光OLEDで高い外部量子効率を達成します.
科学分野:
- マテリアルサイエンス 材料科学
- オーガニック・エレクトロニクス
- フォトケミストリー フォトケミストリー
背景:
- 有機発光ダイオード (OLED) は,高度なディスプレイおよび照明アプリケーションのために,効率的で安定したエミッターを必要とします.
- 深青色光発射器は,効率のロールオフと色純度の問題により,依然として課題です.
研究 の 目的:
- 深青色発光OLED用の新しいイリジウム (III) 複合体を合成し,特徴づけること.
- これらの複合体の光物理的および電光発光特性に影響を与える構造-特性関係を調査する.
主な方法:
- フッ素化フェニルピリジンと補助リガンドを含む4つの新しいイリジウム (III) 複合体の合成と特徴付け.
- 電子構造と興奮状態を理解するために,密度関数理論 (DFT) と時間依存 DFT (TD-DFT) の計算.
- 合成された複合体でドーピングされた光OLEDデバイスの製造と試験.
主要な成果:
- 合成されたイリジウム (III) 複合体は,電子を取り除くパーフルオロカルボニル基による広帯のギャップを示している.
- TD-DFT計算は,支配的なHOMO-LUMO移行と,金属からリガンドへの電荷移転 (MLCT) の有意な貢献を確認しています.
- (TF) 2Ir(pic) 複合体は,最も高い光発光量子収量 (74 ± 3%) と,深い青の放射 (CIE座標 (0.141, 0.158)) を有するOLEDの外部量子効率 (17.1%) を達成しました.
結論:
- 開発されたイリジウム (III) 複合体は,高性能の深青色光 OLED に有望である.
- パルフルオロカルボニル基の組み込みと特定のリガンド設計により,効率的な青色放出のために電子特性を効果的に調整します.
- 高い外部量子効率で得られた深青の放射は,OLED技術の重要な進歩を表しています.
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