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Density functional theory(DFT)and time-dependent DFT calculations were performed to evaluate the influence of substituent effect of(1)R=4-Me,(2)R=4-OMe and(3)R=2,3-OC6H4 on the phenyl ring of(C^C*)Pt(Ⅱ)(acac)(C^C*=phenylimidazole,acac=acetylacetone),respectively,on the radiative and nonradiative processes.