Novel compound and organic light-emitting diode, display and lighting device using the same

A compound represented by Formula (1):

• where
• Cu represents a copper;
• PR1R2R3 represents a phosphine compound coordinating with Cu, where R1, R2 and R3 may be the same or different, and represent a linear, branched or cyclic alkyl group having 1-6 carbon atoms or an aromatic cyclic group which may have a substituent;
• R4 and R5 may be the same or different, and represent a linear, branched or cyclic alkyl group having 1-6 carbon atoms or an aromatic cyclic group which may have a substituent;
• R6, R7, R8 and R9 each independently represents a halogen atom, cyano group, nitro group, linear, branched or cyclic alkyl group having 1-6 carbon atoms or H;
• and
• X represents F, Cl, Br or I.