非従来のN-ヘテロサイクリックカルベンを含む2座標Cu (I) コンプレックスからの高効率の光と電光発光
Journal of the American Chemical Society
|February 16, 2019
まとめ
紫色から赤色に調節可能な新型発光銅複合体も開発された. これらの複合体は有機発光ダイオード (OLED) で高い量子効率と性能を達成します.
科学分野:
- 材料科学
- 写真化学
- オーガニック電子
背景:
- 二座標銅 ((I) 複合体は,発光アプリケーションに有望である.
- N-ヘテロサイクルカルベンのリガンドは,調節可能な電子特性を提供します.
- カーバゾリル誘導体は,発光材料の多用途ドナー単位として機能する.
研究 の 目的:
- 新しく発光する2座標銅の複合体を合成し,特徴づけること.
- リガンド構造が放射色と光物理的性質に与える影響を調査する.
- これらの複合体の性能を有機発光ダイオード (OLED) で評価する.
主な方法:
- モノアミドアミノカルベン (MAC*) とダイミドカルベン (DAC*) リガンドによる6つの発光Cu ((I)) 複合体の合成.
- カーバゾリル (Cz) ドナー群の系統的な変化,モノおよびディシアノ置換派生体を含む.
- 放射スペクトル,量子効率,衰退寿命,およびソルバトクロミズム研究を含む光物理的特徴付け.
- 合成された複合体を放射性ドーパントまたはきれいな層として使用したOLEDデバイスの製造と試験.
主要な成果:
- 放射色は,カルベンとカルバゾリル単位を変更することで,270 nm (紫色から赤色) に調整された.
- 複合体は高光発光量子効率 (100%まで) と短い衰退寿命 (≈1μs) を達成した.
- 最先端の光発射器と比べると 放射速度定数は同じでした
- (MAC*) Cu ((Cz) で製造されたOLEDは,高い外部量子効率 (EQE = 19.4%) と明るさ (54,000 cd/m2) を示した.
- 複合体はまた,非常に効率的なきれいな放射性層 (EQE = 16.3%) として機能しました.
結論:
- 開発されたCu (I) 複合体は,効率的な発光のための調整可能なプラットフォームを提供します.
- これらの材料は,高性能OLEDアプリケーションのための大きな可能性を示しています.
- リガンド設計戦略により,排出特性と装置の効率を正確に制御できます.
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