电荷转移兴奋状态促进多重共振延迟光发射器用于高性能窄带电光发射
Zhongyan Huang1, Honghui Xie1, Jingsheng Miao1
1Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China.
Journal of the American Chemical Society
|June 5, 2023
概括
研究人员开发了一种用于多重共振热激活延迟光 (MR-TADF) 发射器的新分子设计. 这一策略显著提高了系统间反向交叉率 (kRISC),提高了窄带有机发光二极管的电光性能.
科学领域:
- 有机电子产品
- 材料科学
- 光物理学
背景情况:
- 多重共振热激活延迟光 (MR-TADF) 发射器为有机发光二极管 (OLED) 提供狭窄的发射光谱.
- 性能通常受到缓慢的反向系统交叉速率 (kRISC) 的限制.
研究的目的:
- 在MR-TADF发射器中开发有效的kRISC战略.
- 提高窄带OLED的发光性能.
主要方法:
- 通过电子捐赠单元与MR框架的直角连接引入多通道反向交叉系统 (RISC) 路径.
- 操纵激发状态能量水平以诱导跨段电荷转移三重状态而不影响MR特征.
主要成果:
- 与原型MR骨架相比, kRISC的效果增加了23倍.
- 实现了接近单元的光发光量子产量和一个大的辐射速率常数.
- 在没有敏感器的设备中,被证明的高最大外部量子效率 (EQEmax) 为37.1%,在超光装置中为42.3%,效率滚动显著降低.
结论:
- 拟议的分子设计策略有效地提高了kRISC和电光性能.
- 开发的发射器 (CzBN3) 对窄带OLED应用具有最先进的性能.
- 这种方法为设计高性能TADF发射器提供了有希望的途径.
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