Two green Ir(III) complexes based on the ligands containing indolo[3,2,1-jk]carbazole and pyrimidine units show high PLQYs and small FWHMs. The OLEDs show good performances with an EQEmax of 31.3% and extremely low efficiency roll-offs.
Two yellow Ir(III) complexes based on the main ligands containing rigid indolo[3,2,1-jk]carbazole and thiazole units show high efficiencies with narrow emission. And the OLEDs show good performances with an EQEmax of up to 25.2% and a FWHM of 31 nm.
Density functional theory has been employed to study indolo[3,2,1-jk]carbazole donor-based dyes, incorporating one and two units of 2,4-dimethoxybenzene auxiliary donors.
Modulating the peripheral large steric hindrance of iridium complexes for achieving narrowband emission and pure red OLEDs with an EQE of 32.0%.
Herein, a simple, yet versatile molecular design was unraveled to develop a narrowband ultraviolet (UV) emitter by strategically integrating indolo[3,2,1-jk]carbazole and carbazole through a non-conjugative mode.