Organic Small Molecule Emitters Possessing Aggregation-induced Emission andExcited-stated Intramolecular Proton Transfer: a Review
DU Feiyue, ZHOU Xu, XIE Shumei, WANG Erjing, WANG Shimin
Hubei Provincial Key Laboratory of Polymers, Key Laboratory for the Green Preparation and Application of Function Materials of Ministry of Education, School of Materials Science and Engineering, Hubei University, Wuhan 430062,China
Abstract: When an organic small molecule with aggregation-induced luminescence (AIE) under aggregation or solid state is excited, the excitons will preferably relax in a radiative way owing to the restriction of intramolecular motion, thus triggering the aggregation-state emission. The AIE occurrence conquers the drawback of aggregation-causing quenching existing in traditional organic emitters, and has found wide applications in organic light-emitting diodes, organic lasers, biomedical diagnosis and therapy, etc. Meanwhile, material with excitation-state intramolecular proton transfer (ESIPT) usually exhibits large Stokes shift and therefore can improve the sensitivity of fluorescent probes. Organic small molecule emitters with the combinations of AIE and ESIPT demonstrate superior solid-state luminescence performance. Herein, the recent progress in the AIE-ESIPT organic small molecule emitters is reviewed in terms of their structures, optoelectronic properties and applications.
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