Journal Highlight: Reversible switching between phosphorescence and fluorescence in a unimolecular system controlled by external stimuli

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  • Published: Aug 6, 2018
  • Author: spectroscopyNOW
  • Channels: UV/Vis Spectroscopy
thumbnail image: Journal Highlight: Reversible switching between phosphorescence and fluorescence in a unimolecular system controlled by external stimuli

A dual‐emissive hexathiobenzene‐based molecule has been reported with significant aggregation‐induced phosphorescence characteristics and reversible switching among blue, green, and yellow phosphorescence that will help to develop smart materials and intelligent optoelectronic devices.

Reversible switching between phosphorescence and fluorescence in a unimolecular system controlled by external stimuli

Chemistry – A European Journal, 2018, online
Jing Xu, Hui Feng, Hao Teng, Guilin Chen, Saifei Pan, Jianrong Chen, Zhaosheng Qian

Abstract: Manipulation of the emission properties of pure organic molecules through external stimuli is attractive but challenging. Herein, a dual‐emissive hexathiobenzene‐based molecule is reported with significant aggregation‐induced phosphorescence characteristics, and demonstrates reversible switching among blue, green, and yellow phosphorescence by controlling molecular aggregation state or protonation state. Variation of solvent or pH value manipulates the interconversion between fluorescence and phosphorescence, while the change in protonation state in organic solvent switches two short‐lived emissions in a controllable manner. Such a controlled manipulation is achieved by the rational design of combining a twisted structure and the proper arrangement of energy gaps among different excited states. This work provides a new design principle for organic molecules with efficient room‐temperature phosphorescence and tunable singlet–triplet emissive properties, and contributes to the design and development of smart materials and intelligent optoelectronic devices.

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