Complexes Cu Mes MIC Naph NPh2 and Cu Mes MIC NPh2 have similar emission bands at around 400 nm, which can be assigned to the LE excited state of diphenylamide Notably, Cu Mes MIC Naph NPh2 has two additional shoulder emission bands at 490 and 524 nm, , which likely originates from local triplet states partly delocalized on the naphthyl moieties.