Wu Yixin, Xin Yangyang, Pan Yi, Yiu Shek-Man, Yan Jie, Lau Kai Chung, Duan Lian, Chi Yun
Department of Chemistry, Department of Materials Science and Engineering, Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong, SAR, 999077, China.
Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
Adv Sci (Weinh). 2024 Jul;11(26):e2309389. doi: 10.1002/advs.202309389. Epub 2024 Apr 30.
Ir(III) carbene complexes have been explored as one of the best blue phosphors for their high performance. Herein, the authors designed and synthesized a series of blue-emitting Ir(III) phosphors (f-ct9a-c), featuring fac-coordinated cyano-imidazo[4,5-b]pyridin-2-ylidene cyclometalates. These Ir(III) complexes exhibit true-blue emission with a peak maximum spanning 448-467 nm, with high photoluminescence quantum yields of 81-88% recorded in degassed toluene. Moreover, OLED devices bearing phosphors f-ct9a and f-ct9b deliver maximum external quantum efficiencies (EQE) of 25.9% and 30.3%, together with Commission Internationale de L'Eclairage (CIE) coordinates of (0.157, 0.225) and (0.142, 0.169), respectively. Remarkably, the f-ct9b-based device displays an incredible EQE of 29.0% at 5000 cd·m. The hyper-OLED device based on f-ct9b and ν-DABNA exhibits an EQE of 34.7% and CIE coordinates of (0.122, 0.131), affirming high potentials in achieving efficient blue electroluminescence.
铱（III）卡宾配合物因其高性能而被视为最佳蓝色磷光体之一。在此，作者设计并合成了一系列发射蓝光的铱（III）磷光体（f-ct9a-c），其特点是具有面式配位的氰基-咪唑并[4,5-b]吡啶-2-亚基环金属化物。这些铱（III）配合物呈现真蓝光发射，最大发射峰在448 - 467纳米范围内，在脱气甲苯中的光致发光量子产率高达81 - 88%。此外，含有磷光体f-ct9a和f-ct9b的有机发光二极管（OLED）器件的最大外量子效率（EQE）分别为25.9%和30.3%，国际照明委员会（CIE）坐标分别为（0.157, 0.225）和（0.142, 0.169）。值得注意的是，基于f-ct9b的器件在5000 cd·m时显示出高达29.0%的惊人EQE。基于f-ct9b和ν-DABNA的超OLED器件的EQE为34.7%，CIE坐标为（0.122, 0.131），这表明其在实现高效蓝色电致发光方面具有很高的潜力。
