具有聚集诱导发光(AIE)性质的有机化合物能够在聚集或固态条件下,通过改变分子组成、扭曲构象、刚性结构、堆积形态等调节荧光发射强度和波长,使其在OLED、化学/生物传感器等领域具有广阔应用前景。本文介绍了到目前有关AIE的研究进展。侧重总结了silole型、取代乙烯型(主要包括亚甲基环戊二烯型和DPDSB型)、腈取代二苯乙烯型、吡喃型、联苯型等小分子化合物和少数高分子化合物的结构与AIE性质之间的关系,同时介绍了为解释AIE现象所提出的限制分子内转动、避免非辐射去活、构象扭曲避免形成excimer、J-聚集态以及形成分子间的C—H/π键等理论。
Light emissions of the organic dyes are often quenched when the luminophors are fabricated into solid thin films, which have greatly limited their scope of practical applications, such as organic light-emitting diodes,chemosensors/biosensors etc. So that, the organic compounds with excellent emission properties at aggregate state or solid state, that are, aggregation-induced emission (AIE), aggregation-induced emission enhancement (AIEE) and crystallization-induced emission enhancement (CIEE) properties, attract more and more attentions. They can get tunable intensity and wavelength of emission by adjusting molecular structure, twisted conformation, rigidity of structure and stack morphology etc. This review focuses on the structures and mechanisms about AIE, AIEE and CIEE. The kinds of compounds with AIE, AIEE and CIEE are summarized, mainly including siloles, substituted ethenes (including fulvene and DPDSB style), CN-substituted phenylene vinylenes, pyrans, biphenyl compounds and polymers. Herein some theories explaining AIE, AIEE and CIEE are introduced including RIR (restriction of intramolecular rotation), non-activation by avoiding non-radiative decay, preventability of excimers by twisted conformation, J-aggregate state and intermolecular C-H/π interaction.