Efficient bipolar AIE emitters for high-performance nondoped OLEDs

Abstract

Three luminogens were designed and synthesized by integrating TPE with hole-transporting carbazole (Cz) and/or electron-transporting 1,2-diphenyl-1H-benzimidazole (PBi), and bare tetraphenylethene and another donor–acceptor (D–A) compound with aggregation-caused quenching (ACQ) were also prepared for comparison. In nondoped OLEDs, the best one with both aggregation-induced emission (AIE) properties and donor–acceptor (D–A) structures showed excellent performances with L_max, CE_max, PE_max, and EQE_max of 24 308 cd m⁻², and 15.10 cd A⁻¹, 14.82 lm W⁻¹, and 5.34%, respectively, which reached the theoretical limit of fluorescent OLEDs.