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
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: ARTICLES
• 页码范围: 467-477
• 页数: 11页
• 语种: 英文

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 BrOD-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 BrOD-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 (ΦPL) of up to 23％ and CIE coordinates of (0.32,0.32).