Yin Chen, Xin Yangyang, Huang Tianyu, Zhang Qisheng, Duan Lian, Zhang Dongdong
Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Department of Chemistry, Tsinghua University, Beijing, China.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, China.
Nat Commun. 2025 Jan 2;16(1):30. doi: 10.1038/s41467-024-55564-5.
The further success of OLED beyond conventional low-luminance display applications has been hampered by the low power efficiency (PE) at high luminance. Here, we demonstrate the strategic implementation of an exceptionally high-PE, high-luminance OLED using a phosphor-assisted thermally-activated-delayed-fluorescence (TADF)-sensitized narrowband emission. On the basis of a TADF sensitizing-host possessing a fast reverse intersystem crossing, an anti-aggregation-caused-quenching character and a good bipolar charge-transporting ability, this design achieves not only a 100% exciton radiative consumption with decay times mainly in the sub-microsecond regime to mitigate exciton annihilations for nearly roll-off-free external quantum efficiency, but also narrowband emission with both small energetic loss during energy transfer and resistive loss with increasing luminance. Consequently, besides a maximum PE of 187.7 lm/W, an exceptionally high critical maximum luminance (where a PE of 100 lm/W is maintained) of over 110,000 cd/m is achieved for the proof-of-the-concept device, nearly one-of-magnitude higher than the previous record.
高亮度下的低功率效率（PE）阻碍了有机发光二极管（OLED）在传统低亮度显示应用之外的进一步成功。在此，我们展示了一种采用磷光辅助热激活延迟荧光（TADF）敏化窄带发射的超高PE、高亮度OLED的策略性实现。基于具有快速反向系间窜越、抗聚集猝灭特性和良好双极电荷传输能力的TADF敏化主体，该设计不仅实现了100%的激子辐射消耗，其衰减时间主要在亚微秒范围内，以减轻激子湮灭，实现几乎无滚降的外量子效率，还实现了窄带发射，在能量转移过程中能量损失小，且随着亮度增加电阻损失小。因此，除了实现187.7 lm/W的最大PE外，概念验证器件还实现了超过110,000 cd/m的超高临界最大亮度（保持100 lm/W的PE），比之前的记录高出近一个数量级。
