Quantum dot film, preparation method thereof, QLED (Quantum dot Light-Emitting Diode) device and preparation method thereof

Abstract

The invention belongs to the technical field of quantum dots, and particularly relates to a quantum dot film, a preparation method thereof, a QLED (Quantum dot Light-Emitting Diode) device and a preparation method thereof. The preparation method of the quantum dot film comprises the steps of providing a quantum dot prefabricated film and a solution containing a displacement ligand, wherein the quantum dot in the quantum dot prefabricated film contains an initial surface ligand, the structural general formula of the displacement ligand is X1-R-X2, both X1 and X2 are a functional group capable of being bound with the surface of the quantum dot, and R is an alkyl or alkyl derivative with a conjugated group; and carrying out gas-phase ligand displacement on the quantum dot prefabricated film and the solution containing the displacement ligand to obtain a quantum dot film with the quantum dot surface being bound with the displacement ligand. The displacement ligand with the conjugated groupis adopted to carry out ligand displacement without the problem of solution settlement, the carrier transmission in the quantum dot film is improved, and the light-emitting performance of the devicecan be correspondingly improved.

Description

technical field

[0001] The invention belongs to the technical field of quantum dots, and in particular relates to a quantum dot thin film and a preparation method thereof, as well as a QLED device and a preparation method thereof. Background technique

[0002] Quantum dot light-emitting diode (QLED) is a new type of light-emitting device, which uses quantum dot materials (Quantum dots, QDs) as the light-emitting layer, which has incomparable advantages compared with other light-emitting materials, such as Controlled small size effect, ultra-high internal quantum efficiency, excellent color purity, etc., have great application prospects in the field of display technology in the future. In general, organic ligands are attached to the surface of quantum dots through chelation and other methods.

[0003] The surface ligands of quantum dots play a vital role in the synthesis of quantum dots. On the one hand, surface ligands can passivate the defects on the surface of quantum dot...

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