QLED, preparation method and display apparatus

Abstract

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.

Description

technical field

[0001] The present application relates to the field of display technology, in particular to a QLED, a manufacturing method and a display device. Background technique

[0002] With the continuous development of the TV industry, high color gamut displays have become the mainstream trend of the TV industry. ) technology-based QLED display, in addition to the advantages of a wide color gamut, it also has many advantages such as high brightness, fast response speed, and better HDR effects, and has a very broad application prospect.

[0003] figure 1 It is a schematic structural diagram of a common QLED. Such as figure 1 As shown, the flexible QLED display screen includes a substrate 10 , an anode layer 20 , a hole transport layer 30 , a light emitting layer 40 , an electron transport layer 50 and a cathode layer 60 in sequence. When an appropriate voltage is applied between the anode layer 20 and the cathode layer 60 of the QLED display, the holes in the anode...

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