重原子的外围修改策略用于高性能多共振热激活延迟光发射器
Liang Wan1, Zhuang Cheng1, Xiaobo Ma1
1State Key Laboratory of Supramolecular Structure and Materials, Department of Chemistry, Jilin University, Changchun, 130012, P. R. China.
Chemistry (Weinheim an der Bergstrasse, Germany)
|February 11, 2025
概括
将重原子引入多共振热激活延迟光 (MR-TADF) 材料可以提高反向系统间交叉 (RISC) 率. 这导致有机发光二极管 (OLED) 的效率提高和滚动减少.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 光物理学的光学物理学
背景情况:
- 多共振热激活延迟光 (MR-TADF) 材料为窄带有机发光二极管 (OLED) 提供高效率.
- 对于MR-TADF材料来说,一个重大挑战是效率的下降,这通常是由缓慢的反向系统间交叉 (RISC) 过程引起的.
研究的目的:
- 为了研究将重原子引入MR-TADF发射器分子结构的影响.
- 为了提高RISC率并减轻OLED设备的效率下降.
主要方法:
- 基于B/N框架的两个新型TADF发射器BNDBT (含硫重原子) 和BNDBF (不含重原子) 的合成和表征.
- 光发光量产量 (PLQY) 的测量.
- 确定RISC率 (kRISC) 和评估绿色OLED中的设备性能.
主要成果:
- BNDBT和BNDBF都实现了高的PLQY (分别为90%和87%).
- 与BNDBF (2.09×104 s-1) 相比,BNDBT的RISC率显著更高 (6.02×104 s-1).
- 基于BNDBT的OLED显示出优越的外部量子效率 (35.5%),在高亮度下降了效率滚动,并保持了颜色纯度.
结论:
- 在B/N骨架的底部加入重原子,如硫,有效地提高了RISC速率.
- 这一策略通过减少效率滚动和保持颜色纯度来提高OLED性能.
- 这些发现为开发高级OLED应用的高性能MR-TADF发射器提供了可行的方法.
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