Quantum dot light-emitting device and method for patterning quantum dot layer

A display device, comprising a quantum dot light-emitting device, the quantum dot light-emitting device comprising:

• a substrate;
• a quantum dot layer located on the substrate;
• wherein the quantum dot layer comprises a first quantum dot unit, a second quantum dot unit and a third quantum dot unit that emit light of different colors, orthographic projections of the first quantum dot unit, the second quantum dot unit and the third quantum dot unit on the substrate do not overlap with each other, a distance between a bottom surface of the first quantum dot unit and a surface of the substrate, a distance between a bottom surface of the second quantum dot unit and the surface of the substrate, and a distance between a bottom surface of the third quantum dot unit and the surface of the substrate increase sequentially;
• wherein:
• an azobenzene compound layer is arranged between the substrate and the first quantum dot unit, between the first quantum dot unit and the second quantum dot unit, and between the second quantum dot unit and the third quantum dot unit, an orthographic projection of the azobenzene compound layer on the substrate completely covers the substrate, and an azobenzene compound of the azobenzene compound layer has a trans structure.