Efficient narrowband yellow organic light-emitting diodes based on iridium(III) complexes with rigid indolo[3,2,1-jk]carbazole unit

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 EQE max of up to 25.2% and a FWHM of 31 nm.