Two new mononuclear Cu (I) complexes based on 2-(2′-pyridyl) benzimidazolyl derivative ligand containing hole-transporting carbazole (L),[Cu (L)(DPEphos)](BF4) and [Cu (L)(PPh3) 2](BF4), where L=(4-(9H-carbazol-9-yl) phenyl) methyl-2-(2′-pyridyl) benzimidazole; DPEphos= bis [2-(diphenylphosphino) phenyl] ether and PPh3= triphenylphosphine, have been synthesized and characterized on the basis of elemental analysis, 1H NMR and FT- ...