Organic film function material is accurately evaporated, with vacuum thermal evaporation method, under the monitoring of film thickness controller with high precision. A kind of multilayer structure highly bright red organic lightemitting device is developed, with the host and doping material evaporated at the same time in the same vacuum chamber as the emitting layer, the typical structure of which is ITO-CuPc(20 nm)-αNPD(60 nm)-Alq3 (40 nm)∶Rubrene(10%)∶DCJTB(1%)-Alq3(20 nm)-LiF(10 nm)-Al(100 nm). The results show that the brightness increases linearly with the driving voltage of 5～52 V. The electroluminescent spectrum of the device shifts to the blue region, the wavelength of the emission peak changes from 638 nm to 632 nm, and at the same time, the color coordinates CIE change accordingly. When the driving voltage is low (5 V), the luminous efficiency peaks with 0.497 lm·W-1, which declines slowly with the rise of driving voltage.