BLUE ORGANIC ELECTROLUMINESCENT DEVICE AND PREPARATION METHOD THEREOF

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A blue organic electroluminescent device, composed of a substrate (1), an anode layer (2), an anode modification layer (3), a hole transport-electron blocking layer (4), a hole-dominated light-emitting layer (5), an electron-dominated light-emitting layer (6), a hole blocking-electron transport layer (7), a cathode modification layer (8), and a cathode layer (9) arranged in sequence; the electron-dominated layer (6) is composed of organic sensitised material, blue organic light-emitting material, and electron-type organic host material. Selecting rare earth complexes of matching energy levels such as Tm (acac) 3phen or Dy (acac) 3phen as the organic sensitised material, and doping trace amounts of same into the electron-dominated light-emitting layer (6), which has the function of a charge carrier deep binding centre and an energy transport ladder, improves the light-emitting effectiveness, spectral stability, and service life of the device, reduces the operating voltage of the device, and delays the attenuation of effectiveness of the device.