113087-90-4Relevant academic research and scientific papers
Reversible Switching between Phosphorescence and Fluorescence in a Unimolecular System Controlled by External Stimuli
Xu, Jing,Feng, Hui,Teng, Hao,Chen, Guilin,Pan, Saifei,Chen, Jianrong,Qian, Zhaosheng
supporting information, p. 12773 - 12778 (2018/09/06)
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.
Molecular asterisks with a persulfurated benzene core are among the strongest organic phosphorescent emitters in the solid state
Fermi, Andrea,Bergamini, Giacomo,Peresutti, Romain,Marchi, Enrico,Roy, Myriam,Ceroni, Paola,Gingras, Marc
, p. 113 - 122 (2014/08/18)
A series of functionalized persulfurated benzene molecules were synthesized. Their photophysical properties and crystal structures were analyzed. All compounds are non-emitting in solution at room temperature, but in a sharp contrast, quantum yields can be very high (up to 100%) in the solid state at 298 K or in a rigid matrix at low temperatures. This is a consequence of a decrease of intramolecular rotations and motions, but conformational and rotamer issues along with substituent effects might also play a role. These compounds are among the rare examples of highly phosphorescent organic materials, due to a Crystallization Induced Phosphorescence or to an Aggregation Induced Phosphorescence. Compound 1 is among the most phosphorescent solid known to date. They thus represent an alternative to heavy metal ion-based triplet emitters in solid state.
