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具有桥循环的多共振发射器:光谱缩小与加速反向系统间交叉相协同

Tianjiao Fan¹, Qiwei Liu², Chunlin Xu¹

¹Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.

Science bulletin

|January 23, 2026

概括

研究人员开发了新的蓝色发射器,使用-碳桥式循环对多共振 (MR) -热激活延迟光 (TADF) 设备. 这种方法提高了颜色的纯度和效率,实现了高的外部量子效率 (EQE) 和降低了滚动.

科学领域:

有机电子学有机电子学
材料科学是一种材料科学.
光物理学的光学物理学

背景情况:

在多共振 (MR) 热激活延迟光 (TADF) 发射器中的分子内循环调节光电子特性.
同时实现光谱缩小 (FWHM) 和加速反向系统间交叉 (RISC) 是TADF发射器设计的一个重大挑战.

研究的目的:

为MR骨引入-碳桥梁循环化策略.
为了协同抑制分子振动并增强TADF发射器中的自旋轨道合.
开发高性能蓝色发射器,具有窄带发射和提高效率.

主要方法:

合成了两种蓝色发射器,一种是氧化物桥接 (BCzBN-PO),另一种是硫化物桥接 (BCzBN-PS),具有碳桥.
研究了骨硬化和重原子 (和硫) 对光物理性质的影响.
制造的非敏感和TADF敏感的有机发光二极管 (OLED) 用于评估发射器性能.

主要成果:

BCzBN-PO和BCzBN-PS分别表现出19nm和18nm的FWHMs的窄带蓝色辐射.
与BCzBN-PO (1.1 × 10^5 s^-1) 相比,BCzBN-PS的RISC率显著更高 (kRISC = 8.5 × 10^5 s^-1),这是由于硫重原子效应造成的.
这两种发射器在非敏感设备中都实现了最大的外部量子效率 (EQE) >20%,其中BCzBN-PS表现出优越的性能和降低的效率滚动.
在对TADF敏感的设备中,BCzBN-PS比BCzBN-PO (41.2% EQE,30.1%的滚动) 实现了更高的最大EQE (43.0%) 和更低的效率滚动 (25.9%在1000cd m^-2).

结论:

-碳桥式循环有效平衡MR-TADF发射器中的颜色纯度和激子利用效率.
这种分子工程方法可以为OLED应用开发高性能窄带蓝色发射器.
该研究为设计具有增强光物理性质的先进TADF材料提供了一个新的范式.

关键词:

重原子效应是重原子的影响.多重共振是一种多重共振.这是一个狭窄的排放范围.有机发光二极管有机发光二极管旋转-轨道合器

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