【摘 要】
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White-light emitting (WLE) polymers have attracted continuous attention for their promising applications in solid-state lighting,flexible display and related fi
【机 构】
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Key Laboratory for Polymeric Composite & Functional Materials of Ministry of Education, Key Laborato
论文部分内容阅读
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).
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