Huang Manli, Chen Zhanxiang, Miao Jingsheng, He Siyuan, Yang Wei, Huang Zhongyan, Zou Yang, Gong Shaolong, Tan Yao, Yang Chuluo
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, P. R. China.
Shenzhen Key Laboratory of New Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, P. R. China.
Nat Commun. 2024 Sep 14;15(1):8048. doi: 10.1038/s41467-024-52401-7.
White organic light-emitting diodes (WOLEDs) hold significant promise in illumination and displays, but achieving high efficiency while maintaining stability is an ongoing challenge. Here, we strategically combine a blue donor-acceptor thermally activated delayed fluorescence (TADF) emitter featuring rapid reverse intersystem crossing rate and a yellow multi-resonance TADF emitter renowned for the fast radiative transition process to achieve warm WOLEDs with exceptional power efficiency exceeding 190 lm W and external quantum efficiency (EQE) of 39%, setting records for WOLEDs. Meanwhile, these devices also exhibit an extended operational lifetime (LT) of 446 h at an initial luminance of 1000 cd m. Another group of blue and yellow emitters based on our strategy achieves a standard white emission and a high EQE of 35.6%, confirming the universality of our strategy. This work presents a versatile strategy to harmonize singlet exciton radiation and triplet exciton up-conversion, thus achieving a win-win situation of efficiency and stability.
白色有机发光二极管（WOLED）在照明和显示领域具有巨大潜力，但在保持稳定性的同时实现高效率仍是一个持续的挑战。在此，我们策略性地将具有快速反向系间窜越速率的蓝色供体-受体热激活延迟荧光（TADF）发射体与以快速辐射跃迁过程而闻名的黄色多共振TADF发射体相结合，以实现功率效率超过190 lm/W且外量子效率（EQE）达39%的暖白色WOLED，创造了WOLED的记录。同时，这些器件在初始亮度为1000 cd/m²时还展现出446小时的延长工作寿命（LT）。基于我们的策略的另一组蓝色和黄色发射体实现了标准白色发射以及35.6%的高EQE，证实了我们策略的通用性。这项工作提出了一种通用策略，以协调单重态激子辐射和三重态激子上转换，从而实现效率与稳定性的双赢局面。
