Quantum dots substrate and preparation method thereof

A preparation method of a quantum dots substrate, comprising:

• providing an electrode substrate comprising a substrate and an electrode layer disposed on the substrate, the electrode layer comprising a first electrode and a second electrode disposed at an interval;
• applying quantum dots solution on the electrode substrate, the quantum dots solution comprising quantum dots, nanoparticles, photoinitiators, and solvent, an outer surface of each of the quantum dots being modified with a first ligand, an outer surface of each of the nanoparticles being modified with a second ligand, one of the first ligand and the second ligand being a compound containing a sulfhydryl group and the other being a compound containing a double bond, one or more electrical properties of the quantum dots, the nanoparticles, and the photoinitiators being identical;
• applying a voltage between the first electrode and the second electrode, such that the quantum dots, the nanoparticles, and the photoinitiators are co-deposited on the first electrode or on the second electrode to form an electrodeposited thin film;
• irradiating the electrodeposited thin film with excitation light, wherein under an initiation of the photoinitiators, the first ligand on the outer surface of each of the quantum dots and the second ligand on the outer surface of each of the nanoparticles are subjected to a thiolene click reaction to crosslink so that each of the quantum dots and each of the nanoparticles are connected to form a patterned quantum dots thin film whose pattern is consistent with a pattern of the first electrode or of the second electrode.