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

Kenta Kokado; Kazuki Sada

doi:10.1002/anie.201814462

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

Angew Chem Int Ed Engl. 2019 Jun 24;58(26):8632-8639. doi: 10.1002/anie.201814462. Epub 2019 Apr 1.

Authors

Kenta Kokado¹, Kazuki Sada¹

Affiliation

¹ Department of Chemistry, Faculty of Science, Hokkaido University, Kita10 Nishi 8, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.

PMID: 30811777
DOI: 10.1002/anie.201814462

Abstract

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.

Keywords: aggregation-induced emission; computational chemistry; excited states; materials science; photochemistry.

Publication types

Review