| abstract |
The present application relates to an electroluminescent device, a preparation method thereof, a display panel and a display device, and relates to the field of display technology. The electroluminescent device comprises: a cathode layer and an anode layer disposed opposite to each other, and a cathode layer and an anode layer located between the cathode layer and the anode layer. , and the first light-emitting layer and the second light-emitting layer are arranged in sequence along the direction away from the anode layer. The anode layer is a transparent electrode, and the cathode layer is a total reflection electrode; the first light-emitting layer and the second light-emitting layer are used to form excitons after the cathode layer and the anode layer are electrified to emit light. The wavelength corresponding to the maximum energy of the emission spectrum of the second light-emitting layer is greater than the wavelength corresponding to the maximum energy of the emission spectrum of the first light-emitting layer. The present application reduces the absorption of light by the material during the propagation of light, and improves the device efficiency of the electroluminescent device. |