Aggregation-induced emission
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[1]Aggregation-induced emission (AIE) is a phenomenon in which certain organic luminophores (fluorescent dyes) exhibit stronger emission of light in their aggregated or solid state compared to when they are in solution.[2][3][4] This counterintuitive behavior contrasts with most organic compounds, which typically show reduced photoemission in the solid state due to processes like aggregation-caused quenching. AIE is primarily attributed to restricted molecular motion in the aggregated state (decreased flexibility), which suppresses nonradiative energy dissipation and enhances fluorescence efficiency.[5] The increase of fluorescence emission intensity was also observed upon restriction of molecular motion due to host-guest interactions and viscosity increase,[6] which is not a common behavior of such host-guest complexes.[7]
