| 摘要 |
Embodiments of the invention provide a blue organic electroluminescent device and a preparation method, a display panel and a display apparatus. The blue organic electroluminescent device comprises: a substrate and an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer and a cathode arranged on the substrate successively, the light emitting layer comprises a lower surface layer, an upper surface layer and an intermediate layer; host emitters of the lower surface layer, the upper surface layer and the intermediate layer are all doped with guest emitters, at least one of the doping concentrations in the lower surface layer is greater and the upper surface layer is greater than a doping concentration in the intermediate layer. The power consumption of the blue organic electroluminescent device is greatly reduced; and the efficiency is increased significantly. |
