Four　novel　Cu(I)　complexes,　[Cu(o-PYO)(PPh3)(2)]BF4　(1),　[Cu(o-PYO)(DPEphos)]BF4　(2),　[Cu-2(o-PYO)(PPh3)(3)(CH3CN)](BF4)(2)　(3)　and　[Cu-2(o-PYO)(DPEphos)2](BF4)(2)　(4)　(o-PYO　=　2,5-bis(pyridy1)-1,3,4-oxadiazole,　PPh3　=　triphenylphosphine,　DPEphos　=　bis(2-(diphenylphosphanyl)phenyl)ether),　have　been　synthesized　and　characterized　by　H-1　NMR,　elemental　analysis　and　single-crystal　X-ray　diffraction.　The　central　cuprous　ions　in　all　complexes　are　surrounded　by　N　and　P　atoms　to　form　a　distorted　tetrahedral　geometry,　although　one　of　the　cuprous　ions　in　complex　3　is　coordinated　by　a　PPh3　and　an　acetonitrile　molecule　due　to　the　steric　hindrance　and　weak　coordination　ability　from　monodentate　PPh3　ligand.　The　UV-vis　absorption　spectra　in　CH2Cl2　show　the　characteristic　metal-to-ligand　charge　transfer　(MLCT)　absorption　bands　in　the　region　of　360-480　nm.　Four　Cu(I)　complexes　exhibit　yellow　to　orange-red　phosphorescence　with　the　emission　maximum　at　572,　577,　562　and　597　nm,　respectively　in　the　solid　state.