The blue phosphor Firpic-based electro-phosphorescent metallic micro cavity organic light-emitting device (OLED) employs a structure of glass/Al (15nm)/MoO₃(30nm)/NPB (40nm)/mCP:Firpic (30nm,x%)/BCP(10nm)/Alq(20nm)/LiF( 1nm)/Al(100nm),in which x% (4%, 6%,10%,12%,14%) is the doping mass fraction of Firpic.We prepared different OLE Ds and compared the influence of measuring angle and dopant concentra tion on the luminescence properties of OLEDs.The results show that for the devices with ligh t-emitting area of 0.8cm²,the difference of measuring angles results in shift of blue emission a nd changes of color coordinates.There were two peaks of the devices,which are at 510nm and 472nm.T heir variations are different.The larger peak is attenuated while the smaller peak is continuously e nhanced with the increase of the measuring angle.Furthermore,when the doping concentration is 12%,the OLE D has the best performance.The device has the maximum brightness of 18870cd/m^2u nder 12V,which implies the energy transfer between host and guest is the fulles t.