熱的に活性化された遅延光と,通過空間電荷移転による集積誘発放射
Hiroyuki Tsujimoto, Dong-Gwang Ha, Georgios Markopoulos
1Samsung Research America , 255 Main Street, Suite 702, Cambridge, Massachusetts 02142, United States.
Journal of the American Chemical Society
|March 28, 2017
まとめ
9,9ジメチルキサンテンのブリッジを持つ新しい放射性分子は,有機発光装置に希望を示しています. これらの分子は固体状態で放出が強化され,最大10%の高い外部量子効率をもたらします.
科学分野:
- 有機化学
- 材料科学
- フォト物理学
背景:
- ドナー・アクセプター分子は光電子的アプリケーションに不可欠です.
- 9,9-ジメチルキサンテンは,分子幾何学を制御する硬い橋として機能します.
- 光の効率的な放出には 空間的な電荷伝達が不可欠です
研究 の 目的:
- 9,9-ジメチルキサンテンのコアに基づいた新しい放射性分子 (XPT,XCT,XtBuCT) を合成し,特徴づけること.
- 分子構造,固体包装,光物理学的性質の関係を調査する.
- オーガニック・ライト・エミッティング・デバイス (OLED) でこれらの分子の性能を評価する.
主な方法:
- XPT,XCT,XtBuCT分子の合成
- 量子収量と光寿命測定を含む光物理的特徴付け
- 固体構造を決定するX線結晶学.
- OLEDデバイスの製造とテスト
主要な成果:
- 分子は,電荷移転を促進するコファシアルドナー-受容体の配列 (3.3-3.5 Å) を表している.
- マイクロ秒の寿命で観測された熱活性化遅延光 (TADF).
- 溶液と比較して固体状態での量子産出量がかなり高い.
- 結晶構造は,結合誘発放射を促進する支配的なC-H··π分子間相互作用を明らかにする.
- XPTとXtBuCTドーパントを使用したOLEDは,外部量子効率を10%まで達成しました.
結論:
- 9,9ジメチルキサンテンのブリッジは,制御された分子構造を通して効率的な排出を促進します.
- 集積によって引き起こされる放出は,固体性能の重要な要因です.
- これらの分子は高効率の OLED アプリケーションにとって有望な材料です
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