Eaton's reagent assisted aromatic C–C coupling of carbazoles for optoelectronic applications

Abstract

An Eaton's reagent assisted C(sp²)–C(sp²) coupling via the Scholl reaction mechanism was developed to prepare bicarbazoles without using any solvents and catalysts. The resulting biaryl exhibits unique optoelectronic properties as a promising host material of blue phosphorescent organic light emitting diodes, achieving high current efficiency up to 31.7 cd A⁻¹ with ultralow roll-off.