材料科学
电致发光
发光
咔唑
圆极化
光电子学
量子效率
光化学
光学
纳米技术
物理
化学
图层(电子)
微带线
作者
Zhi‐Ping Yan,Yuan Li,Yuan Zhang,Meng-Xi Mao,Xiang‐Ji Liao,Hua‐Xiu Ni,Zhiheng Wang,Zhongfu An,You‐Xuan Zheng,Jing‐Lin Zuo
标识
DOI:10.1002/adma.202204253
摘要
Abstract The realization of luminescent materials with narrowband and circularly polarized luminescence (CPL) is of great significance for the development of future optical and photonic devices. Herein, through a steric‐hindrance‐assisted dual‐core strategy, two pairs of chiral dual‐core multiple resonance thermally activated delayed fluorescence (MR‐TADF) materials ( R / S ‐DOBN and R / S ‐DOBNT) are directly constructed by the bonding of two organoboron MR‐TADF monocores (SOBN and SOBNT) with carbazole/3,6‐di‐ tert ‐butyl‐9 H ‐carbazole and phenol derivative as donors, realizing obvious CPL and narrowband emissions. Furthermore, the dual‐core effect in the prepared R / S ‐DOBN and R / S ‐DOBNT increases the transition oscillator strength two times more than that of a monocore structure, while maintaining the ultrapure blue emissions peaking at 453 and 459 nm with a narrower full‐width at half‐maximum of 21 nm through reorganization energy reduction. The circularly polarized organic light‐emitting diodes based on the enantiomers exhibit ultrapure blue emission with Commission Internationale de L'Eclairage (CIE) coordinates of (0.14, 0.10) and (0.13, 0.12), high maximum external quantum efficiencies of 23.9% and 25.6%, and obvious circularly polarized electroluminescence with dissymmetry factors (| g EL |) ≈ 10 −3 .
科研通智能强力驱动
Strongly Powered by AbleSci AI