Solid-state emissive organic chromophores are very important for practical thin-film-device applications, such as organic luminescent displays and light sources. However, most organic luminescent materials face major challenges because of low emission efficiency in the aggregated state. To reduce aggregation-caused quenching, several strategies, such as the introduction of bulky substitucnts into the original fluorophores, have been proposed. Tang, Park, and their respective co-workers observed the aggregation-induced emission (AIE) phenomenon, which overcomes fluorescence quenching in the aggregated state. To date, a large number of AIE-active dyes based on silole or tetraphenylethene as the core structure have been developed. Despite successful examples of solid-state emissive materials based on the AIE effect, it is still challenging to design novel core structures for fluorophores with tunable solid-state emission that covers the whole visible (especially red) region, and with large Stokes shifts.
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