A new class of rhodamine luminophores: design, syntheses and aggregation-induced emission enhancement

A new class of rhodamine luminophores, 3',3 ''-bis(oxospiroisobenzofuran)- 3,7-bis(dialkylamino) benzopyrano-xanthene derivatives (ABPX), have been successfully developed. The emission behavior of ABPX series is directly opposite to the concentration quenching of conventional rhodamine dyes. ABPX series exhibit aggregation-induced emission enhancement (AIEE).