扭曲的结构和多个电荷传输通道赋予了热激活的延迟光器件,具有低效率的推出和低度依赖
Yuan-Ye Zhu1, Feng-Ming Xie1, Hao-Ze Li2
1Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.
Chemistry, an Asian journal
|July 29, 2024
概括
这项研究引入了一种新的热激活延迟光 (TADF) 分子,mClSFO,旨在最大限度地降低有机发光二极管 (OLED) 的效率下降. 新的TADF发射器实现了高外部量子效率,并显著减少了滚动,展示了其对先进显示技术的潜力.
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:
- 开发高效的有机发光二极管 (OLED) 以最小的效率滚动关闭对于先进的显示技术至关重要.
- 热激活延迟光 (TADF) 材料提供了高效率的途径,但往往会遇到滚动问题.
研究的目的:
- 设计和合成一种新的TADF分子 (mClSFO),以克服OLED的效率滚动挑战.
- 为了研究新的TADF材料的光物理特性和设备性能.
主要方法:
- 基于螺旋二烯骨架的分子设计,以实现高度扭曲的结构.
- 光物理性质的表征,包括辐射和反向系统间交叉速率.
- 使用mClSFO TADF发射器在各种兴奋剂度下制造和测试OLED设备.
主要成果:
- 由于其扭曲的结构和多个电荷转移通道,mClSFO分子表现出抑制的聚合引起的火 (ACQ).
- 实现了1.6×107 s-1的快速辐射率 (kr) 和1.07×106 s-1的快速反向系统间交叉 (RISC) 率 (kRISC).
- OLED显示出最大的外部量子效率 (EQEmax) 超过20%在10-60重%的兴奋剂度,30重%的兴奋剂设备达到23.1%的EQEmax并保持18.6%的EQE在1000cdm-2.
结论:
- 设计的mClSFO TADF发射器有效地减少了OLED中的效率滚动.
- 该材料显示出出色的激发动力学和低度依赖性,突出显示了其在高性能OLED应用中的巨大潜力.
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