Consideration of Molecular Structure in the Excited State to Design New Luminogens with Aggregation‐Induced Emission

作者：Kenta Kokado, Kazuki Sada · 发表于：Angewandte Chemie International Edition · 年份：2019 · DOI：10.1002/anie.201814462 · 被引用次数：172 · 研究领域：Luminescence and Fluorescent Materials、Synthesis and Properties of Aromatic Compounds、Photochromic and Fluorescence Chemistry

Aggregation-induced emission (AIE) is a photoluminescence phenomenon in which an AIE luminogen (AIEgen) exhibits intense emission in the aggregated or solid state but only weak or no emission in the solution state. Understanding the mechanism of AIE requires consideration of excited state molecular geometry (for example, a π twist). This Minireview examines the history of AIEgens with a focus on the representative AIEgen, tetraphenylethylene (TPE). The mechanisms of solution-state quenching are reviewed and the crucial role of excited-state molecular transformations for AIE is discussed. Finally, recent progress in understanding the relationship between excited state molecular transformations and AIE is overviewed for a range of different AIEgens.