Binaphthol-based chiral host molecules for efficient solution-processed circularly polarized OLEDs

Abstract

Two kinds of chiral hosts, named (R/S)-BN-mCP and (R/S)-BN-2mCP, are prepared. Solution processable circularly polarized organic light-emitting diodes (CP-OLEDs) based on the chiral hosts and achiral emitter Ir(mypp)₃ present the maximum external quantum efficiency (EQE_max) and dissymmetry factor values (g_EL) of 12.7%/−1.7 × 10⁻³ and 17.1%/−1.3 × 10⁻³, respectively. Using (R)-BN-2mCP as the chiral host and Ir(mypp)₃ and Ir(piq)₂(acac) as the achiral emitters, the solution-processed OLED exhibits a broad emission spectrum with the EQE_max of 12.1% and g_EL of −1.1 × 10⁻³.