摘要
Developing efficient dual-phase emission emitters upon organoboron luminophores remains a formidable challenge due to the ubiquitous self-absorption and deleterious π-π interactions from aromatic structure.Here, a new family of benzothiazole-enolate-based organoboron luminophores(HN1-4) with effective dual-phase emission was constructed. HN4 showed almost the highest quantum yield(QY) among this type of compound so far. The three-ring-fused rigid skeleton and moderate intramolecular charge transfer(ICT) effect ensured that HN4 could give rise to extremely strong emission in any solution(QY up to 99%). X-ray crystallographic analysis showed that the twisted core structure constructed by the boronic coordination of two penta-fluorobenzene of HN4 was responsible for intense emission in the solid state(QY up to 68%). Besides, HN4 exhibited a unique response to mechanical force accompanied by a reversible change of the QY. We believe that this strategy provides beneficial inspiration and methodology to design materials with high emissive quantum yield that can be used in a variety of luminescent events.
基金
financially supported by the National Natural Science Foundation of China(No.21975046)
partially from the National Key Research and Development Program of China(No.2017YFA0207700)。
