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

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 .