QLED, preparation method and display apparatus

The invention provides a QLED, a preparation method and a display apparatus. The QLED comprises a substrate, a positive electrode, a hole transport layer, a light emitting layer, an electron transport layer and a negative electrode in sequence; the light emitting layer comprises quantum dots and a dispersing agent with a dendritic molecular structure; and the quantum dots are dispersed among side chains of the dendritic molecules. Compared with long-chain ligands on the surfaces of the quantum dots, an insulating layer is not formed on the surfaces of the quantum dots in the dendritic molecular structure, so that charge injection potential barrier of impedance, holes and electrons to the quantum dots on the surfaces of the quantum dots can be greatly lowered; in addition, the spacings between the quantum dot molecules, between quantum dots and the electron transport layer, and between the quantum dots and the hole transport layer can be closer, thereby improving the concentration of the quantum dots in the light emitting layer, and the exciton energy transfer efficiency; and by virtue of the OLED, the dispersity and yield of the quantum dots can be ensured while the current carrier energy transfer validity can be reinforced, thereby enhancing the light emitting efficiency of the OLED and the luminance of the OLED display apparatus.