系统间交叉
分子内力
磷光
卤素
卤键
量子效率
分子
材料科学
光化学
磷光有机发光二极管
激发态
纳米技术
化学
化学物理
有机发光二极管
光电子学
原子物理学
单重态
物理
荧光
立体化学
有机化学
量子力学
氢键
烷基
图层(电子)
作者
Zhan Yang,Chao Xu,Wenlang Li,Zhu Mao,Xiangyu Ge,Qiuyi Huang,Huangjun Deng,Juan Zhao,Feng Gu,Yi Zhang,Zhenguo Chi
标识
DOI:10.1002/ange.202007343
摘要
Abstract Ultralong organic phosphorescence (UOP) has attracted increasing attention due to its potential applications in optoelectronics, bioelectronics, and security protection. However, achieving UOP with high quantum efficiency (QE) over 20 % is still full of challenges due to intersystem crossing (ISC) and fast non‐radiative transitions in organic molecules. Here, we present a novel strategy to enhance the QE of UOP materials by modulating intramolecular halogen bonding via structural isomerism. The QE of CzS2Br reaches up to 52.10 %, which is the highest afterglow efficiency reported so far. The crucial reason for the extraordinary QE is intramolecular halogen bonding, which can not only effectively enhance ISC by promoting spin–orbit coupling, but also greatly confine motions of excited molecules to restrict non‐radiative pathways. This work provides a reasonable strategy to develop highly efficient UOP materials for practical applications.
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