Embodiments of the invention disclose an electroluminescent device, a display apparatus and a fabrication method of the display apparatus. The electroluminescent device comprises a substrate, a microlight-emitting diode unit arranged on the substrate and configured to emit light with a first color to a first side of the substrate, and an organic light-emitting diode unit stacked on the micro light-emitting diode unit and configured to emit light with a second color to the first side of the substrate, so that the light with the second color is emitted through the micro light-emitting diode unit and mixed with the light with the first color emitted by the micro light-emitting diode unit, or the light with the first color is emitted through the organic light-emitting diode unit and mixed with the light with the second color emitted by the organic light-emitting diode unit. According to the electroluminescent device and the display apparatus, the brightness can be enhanced and the power consumption can be reduced; the problem of weak blue light can be solved; the color light can be balanced and adjusted as needed; the color range is expanded; and the color rendering index is increased.