Yan Jie, Zhou Dong-Ying, Liao Liang-Sheng, Kuhn Martin, Zhou Xiuwen, Yiu Shek-Man, Chi Yun
Department of Materials Science and Engineering, City University of Hong Kong, 999077, Hong Kong, SAR, China.
Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 215123, Suzhou, China.
Nat Commun. 2023 Oct 12;14(1):6419. doi: 10.1038/s41467-023-42090-z.
Efficient Förster energy transfer from a phosphorescent sensitizer to a thermally activated delayed fluorescent terminal emitter constitutes a potential solution for achieving superb blue emissive organic light-emitting diodes, which are urgently needed for high-performance displays. Herein, we report the design of four Ir(III) metal complexes, f-ct1a ‒ d, that exhibit efficient true-blue emissions and fast radiative decay lifetimes. More importantly, they also undergo facile isomerization in the presence of catalysts (sodium acetate and p-toluenesulfonic acid) at elevated temperature and, hence, allow for the mass production of either emitter without decomposition. In this work, the resulting hyper-OLED exhibits a true-blue color (Commission Internationale de I'Eclairage coordinate CIE = 0.11), a full width at half maximum of 18 nm, a maximum external quantum efficiency of 35.5% and a high external quantum efficiency 20.3% at 5000 cd m, paving the way for innovative blue OLED technology.
从磷光敏化剂到热激活延迟荧光终端发射体的高效福斯特能量转移，为实现卓越的蓝色发光有机发光二极管提供了一种潜在解决方案，而高性能显示器迫切需要这种二极管。在此，我们报道了四种Ir(III)金属配合物f-ct1a - d的设计，它们表现出高效的真蓝色发射和快速的辐射衰减寿命。更重要的是，它们在高温下存在催化剂（乙酸钠和对甲苯磺酸）时还能容易地发生异构化，因此能够在不分解的情况下大规模生产任何一种发射体。在这项工作中，所得的超有机发光二极管呈现出真蓝色（国际照明委员会坐标CIE = 0.11），半高宽为18 nm，最大外量子效率为35.5%，在5000 cd m时外量子效率为20.3%，为创新的蓝色有机发光二极管技术铺平了道路。
