半最大全宽
三元运算
有机发光二极管
量子效率
量子产额
光致发光
电致发光
材料科学
荧光
分析化学(期刊)
偶极子
硼
光电子学
光化学
化学
纳米技术
光学
有机化学
物理
图层(电子)
程序设计语言
计算机科学
作者
Xinliang Cai,Jianan Xue,Chenglong Li,Baoyan Liang,Ying Ao,Yi Tan,Shaolong Gong,Yue Wang
标识
DOI:10.1002/anie.202200337
摘要
Herein, a ternary boron-oxygen-nitrogen embedded polycyclic aromatic hydrocarbon with multiple resonance thermally activated delayed fluorescence (MR-TADF), namely DBNO, is developed by adopting the para boron-π-boron and para oxygen-π-oxygen strategy. The designed molecule presents a vivid green emission with a high photoluminescence quantum yield (96 %) and an extremely narrow full width at half maximum (FWHM) of 19 nm/0.09 eV, which surpasses all previously reported green TADF emitters to date. In addition, the long molecular structure along the transition dipole moment direction endows it with a high horizontal emitting dipole ratio of 96 %. The organic light-emitting diode (OLED) based on DBNO reveals a narrowband green emission with a peak at 504 nm and a FWHM of 24 nm/0.12 eV. Particularly, a significantly improved device performance is achieved by the TADF-sensitization (hyperfluorescence) mechanism, presenting a FWHM of 27 nm and a maximum external quantum efficiency (EQE) of 37.1 %.
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