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Effective Design Strategy for Thermally Activated Delayed Fluorescence Emitters with Aggregation-Induced emission to Enable Sky-blue OLEDs Achieving EQE Nearly 30%
Chemical Science ( IF 7.6 ) Pub Date : 2024-11-20 , DOI: 10.1039/d4sc06613h
Hui Dai, Yaohui Liang, Xiang Long, Tianyi Tang, Haozhi Xie, Zhiwei Ma, Gaoyu Li, Zhiyong Yang, Juan Zhao, Zhenguo Chi

Pure organic thermally activated delayed fluorescence (TADF) materials hold great promise for efficient organic light-emitting diodes (OLEDs), yet developing high-performing blue TADF materials that integrate short delayed lifetime with aggregation induced emission (AIE) property remains a significant challenge. In this study, we developed three highly-efficient blue TADF emitters (32clCBP, 32clCXT and 32PclCXT) featuring AIE characteristics by integrating rigid π-extended donors with different acceptors. Notably, in the doped 32PclCXT film achieved an exceptionally high photoluminescence quantum efficiency of up to 99% and a short delayed lifetime of 1.4 µs. Furthermore, the fabricated OLEDs based on 32PclCXT exhibited an impressive external quantum efficiency of 29.9% in the sky-blue region, along with low roll-off at high luminance. Therefore, this work establishes a new strategy for developing high-efficiency blue TADF materials and devices.

中文翻译:


具有聚集诱导发射的热激活延迟荧光发射器的有效设计策略,使天蓝色 OLED 实现近 30% 的 EQE



纯有机热激活延迟荧光 (TADF) 材料在高效有机发光二极管 (OLED) 方面前景广阔,但开发将短延迟寿命与聚集诱导发射 (AIE) 特性相结合的高性能蓝色 TADF 材料仍然是一项重大挑战。在这项研究中,我们通过将刚性π延伸供体与不同的受体整合,开发了三种具有 AIE 特性的高效蓝色 TADF 发射器 (32clCBP、32clCXT 和 32PclCXT)。值得注意的是,在掺杂的 32PclCXT 薄膜中实现了高达 99% 的极高光致发光量子效率和 1.4 μs 的短延迟寿命。此外,基于 32PclCXT 制造的 OLED 在天蓝色区域表现出令人印象深刻的 29.9% 的外部量子效率,以及在高亮度下的低滚降。因此,这项工作为开发高效蓝色 TADF 材料和器件建立了新的策略。
更新日期:2024-11-20
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