A series of copper complexes with carbazole and oxadiazole moieties: Synthesis, characterization and luminescence performance

► Diamine ligands with various moieties and Cu(I) complexes are synthesized. ► Crystal structures and photophysical property are discussed in detail. ► The incorporation of substituent moieties improves luminescence performance. ► Solvent-induced exciplex quenching is suppressed by substituent moieties.