Dibenzo-1,4-azaborine (DBAB) derivatives containing boron–oxygen bonds were synthesized and their optical properties were investigated. In toluene, 2BO2Dpa exhibited ultrapure violet photoluminescence at 399 nm (FWHM, 17 nm). A 2BO2Dpa-based OLED exhibited blue-violet electroluminescence at 404 nm (FWHM, 40 nm), indicating the potential of B─O-containing DBABs as ultraviolet emitters.

Abstract

Ultraviolet (UV)-emissive organic luminophores have attracted significant attention owing to their potential biological and industrial applications. In this study, a novel dibenzo-1,4-azaborine (DBAB) derivative 2BO2Dpa containing boron-─oxygen bonds were synthesized. In toluene, 2BO2Dpa exhibited a sharp violet-blue photoluminescence centered at 399 nm, with a full width at half maximum of 17 nm. Furthermore, organic light-emitting diodes based on 2BO2Dpa exhibited blue-violet electroluminescence centered at 404 nm, demonstrating their potential for application as near-UV emitters.