Boosting the triplet activity of heavy-atom-free difluoroboron dibenzoylmethane via sp3 oxygen-bridged electron donors

Abstract

Purely organic phosphors have important applications in imaging, sensing, informatics and illumination. Methoxy-substituted difluoroboron dibenzoylmethane (BF₂dbm) complexes exhibit intense fluorescence with an almost unity quantum yield. Here we show that by simply introducing an sp³ oxygen-bridged methoxylphenyl group as a pendant to BF₂dbm, the boron complex exhibits a triplet quantum yield of 0.16, a more than 100-fold increase compared to that of BF₂dbm.