Novel boron-and sulfur-doped polycyclic aromatic hydrocarbon as multiple resonance emitter for ultrapure blue thermally activated delayed fluorescence polymers

作     者：Fan Chen Lei Zhao Xingdong Wang Qingqing Yang Weili Li Hongkun Tian Shiyang Shao Lixiang Wang Xiabin Jing Fosong Wang Fan Chen;Lei Zhao;Xingdong Wang;Qingqing Yang;Weili Li;Hongkun Tian;Shiyang Shao;Lixiang Wang;Xiabin Jing;Fosong Wang

作者机构：State Key Laboratory of Polymer Physics and ChemistryChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and EngineeringUniversity of Science and Technology of ChinaHefei 230026China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2021年第64卷第4期

页      面：547-551页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China(52073282,51833009,21975247) the National Basic Research Program of China(2015CB655000) the Youth Innovation Promotion Association of Chinese Academy of Sciences(2015180) 

主　　题：polycyclic aromatic hydrocarbon boron sulfur multiple resonance thermally activated delayed fluorescence 

摘      要：Boron(B)-and sulfur(S)-doped polycyclic aromatic hydrocarbons(PAHs)are developed as a novel kind of multiple resonance emitters for ultrapure blue thermally activated delayed fluorescence(TADF)polymers with narrowband *** combination of electron-deficient B atom and electron-rich S atom in PAH can form an intramolecular push-pull electronic system in a rigid aromatic framework,leading to reduced singlet-triplet energy splitting and limited structure relaxation of excited *** critical roles of S atom in determining emission properties with respect to the oxygen analogues are in two aspects:(i)reducing energy bandgap to shift emission from human-eye-insensitive ultraviolet zone to blue region,and(ii)promoting reverse intersystem crossing process by heavy-atom effect to activate TADF *** resulting polymer containing B,S-doped PAH as emitter and acridan as host exhibits efficient blue electroluminescence at 458 nm with small full-width at halfmaximum of 31 nm,representing the first example for ultrapure TADF polymer with narrowband electroluminescence.