A new phosphorescent material with the structure of ITO/PVK:TOPPPt/BCP(20 nm)/Mg:Ag(200 nm) is fabricated based on Pt complex.The polymer doped organic light-emitting diodes with the concentrations of 2% and 4% are studied respectively.The relative characteristics of the devices are studied.The results show that the peak at 625 nm is the emission spectrum of TOPPPt,and the emission spectrum of TOPPPt almost have no change at different driving voltages and the electro-phosphorescent characteristics of TOPPPt...