Achieving white-light emission in a single-component polymer with halogen-assisted interaction  

作　　者：Zhuxin Zhou Zhu Mao Zhan Yang Tingting Yang Longji Zhu Yubo Long Zhenguo Chi Siwei Liu Matthew P.Aldred Xudong Chen Jiarui Xu Yi Zhang 

机构地区：[1]Key Laboratory for Polymeric Composite&Functional Materials of Ministry of Education,Key L aboratory for High-Performance Polymer Composites of Guangdong Province,Guangdong Engineering Technology Research Centre for High-performance Organic and Polymer Photoelectric Functional Films,State Key Laboratory of Optoelectronic Materials and Technologies,School of Chemistry,Sun Yat-sen University,Guangzhou 510275,China [2]Lomox Limited,Bank House,Market Square,Congleton,Cheshire CW121ET,United Kingdom [3]Shenzhen Yanyi New Materials Co.,Ltd.,Shenzhen 518110,China

出　　处：《Science China Chemistry》2021年第3期467-477,共11页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(51873239,51373204,U20A20255);the Science and Technology Project of Guangdong Province(2015B090915003,2019B040401002,2020B010182001);National Basic Research Program of China(2014CB643605);the Leading Scientific,Technical and Innovation Talents of Guangdong Special Support Program(2016TX03C295);the Natural Science Foundation of Guangdong Province(2114050001078)。

摘　　要：White-light emitting(WLE) polymers have attracted continuous attention for their promising applications in solid-state lighting,flexible display and related fields. However, achieving dual-emission and pure white-light emission in a single-component polymer is still challenging. In this study, a brominated single-component polymer Br OD-TFB was designed and synthesized,which shows dual-emission and white light emission properties in solution and room-temperature phosphorescence(RTP) in thin films. The dual-emission properties can be tuned by concentration, solvent polarity, and excitation energy. Spectral analyses and theoretical calculations reveal that the origin of the high-energy emission band(HEB) is intramolecular charge transfer(ICT)along the polymer chain, whilst the low-energy emission band(LEB) originates from the excited-state related to the intra-chain and inter-chain C–Br···π interactions as demonstrated by the single-crystal structure of the model compound. Appropriate control of the formation and the destruction of the halogen-assisted interactions can initiate white-light emission in the singlecomponent polymer. More interestingly, by dispersing Br OD-TFB(0.1 wt%) in a non-emissive, colorless and transparent polymer, the characteristics of this white-light emission can be fully demonstrated while exhibiting unexpected RTP properties,with photoluminescence quantum efficiency(Φ_(PL)) of up to 23% and CIE coordinates of(0.32, 0.32).

关 键 词：white-light emission single-component polymer halogen-assisted interaction functional polyimide mechanism 

分 类 号：TN383.1[电子电信—物理电子学] TQ317[化学工程—高聚物工业]