FIGS. 5A and 5B show an electroluminescence (EL) spectrum and a plot of EQE vs. luminance, respectively, of PdON3S56 in a device having the structure: ITO (40 nm)/HATCN (10 nm)/NPD (40 nm)/BisPCz (10 nm)/10% PdON3S56:mCBP (25 nm)/PO15 (10 nm)/BPyTP (40 nm)/Liq (2...