共发射极
量子效率
系统间交叉
材料科学
光电子学
荧光
有机发光二极管
二极管
光学
纳米技术
原子物理学
物理
激发态
图层(电子)
单重态
作者
Junki Ochi,Yuji Yamasaki,Kichinosuke Tanaka,Yasuhiro Kondo,Kohei Isayama,Susumu Oda,Masakazu Kondo,Takuji Hatakeyama
标识
DOI:10.1038/s41467-024-46619-8
摘要
Abstract An ultrapure deep-blue multi-resonance-induced thermally activated delayed fluorescence material (DOB2-DABNA-A) is designed and synthesized. Benefiting from a fully resonating extended helical π-conjugated system, this compound has a small ΔE ST value of 3.6 meV and sufficient spin–orbit coupling to exhibit a high-rate constant for reverse intersystem crossing ( k RISC = 1.1 × 10 6 s –1 ). Furthermore, an organic light-emitting diode employing DOB2-DABNA-A as an emitter is fabricated; it exhibits ultrapure deep-blue emission at 452 nm with a small full width at half maximum of 24 nm, corresponding to Commission Internationale de l’Éclairage (CIE) coordinates of (0.145, 0.049). The high k RISC value reduces the efficiency roll-off, resulting in a high external quantum efficiency (EQE) of 21.6% at 1000 cd m –2 .
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