Quantum dot light-emitting layer, preparation method thereof and QLED

Abstract

The invention belongs to the field of quantum dot light-emitting diodes and provides a quantum dot light-emitting layer, a preparation method thereof and a QLED. The quantum dot light-emitting layer comprises quantum dots and ligands chelated with the quantum dots. Each ligand comprises C2-C10 compounds containing polar coordinating groups and has the charge transmission property. The preparation method comprises the steps of providing a mixed solution of the quantum dots and the ligands having the charge transmission property, preparing a quantum dot solution containing the ligands having the charge transmission property, and forming a quantum dot light-emitting layer by utilizing the quantum dot solution in the deposition manner. Or, the method comprises the steps of respectively providing a ligand solution having the charge transmission property and the quantum dot light-emitting layer, subjecting the quantum dot light-emitting layer and the ligands having the charge transmission property to the replacement reaction, and obtaining a quantum dot light-emitting layer containing chelated ligands having the charge transmission property. The QLED comprises a cathode layer, an anode layer and an organic functional layer. The organic functional layer comprises the above quantum dot light-emitting layer.

Description

technical field [0001] The invention belongs to the field of quantum dot light-emitting diodes, and in particular relates to a quantum dot light-emitting layer, a preparation method thereof and a QLED. Background technique [0002] Quantum dots (quantumdot, QD), also known as semiconductor nanocrystals, are nanocrystalline particles with a radius smaller than or close to the radius of the Bohr excitons. The size is very small, and the particle size is generally between 1-20nm. Quantum dots have a quantum confinement effect, can emit fluorescence after being excited, and quantum dots have unique luminescence characteristics, such as wide excitation peak, narrow emission peak, and adjustable luminescence spectrum, making them widely used in the field of optoelectronics prospect. Quantum dot light-emitting diode display (quantum dot light emitting device, QLED) is a device prepared by using colloidal quantum dots as the light-emitting layer with a sandwich structure, that is, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a quantum dot luminescent layer, aiming at solving the problem that the quantum dot ligand in the existing quantum dot luminescent layer is a long alkane chain segment ligand, which leads to poor charge transport properties, high QLED start-up voltage, and low QLED energy efficiency. not high problem