White-light quantum dot light-emitting diode and preparation method thereof

A quantum dot light-emitting and diode technology, which is applied in semiconductor/solid-state device manufacturing, electrical components, electric solid-state devices, etc., can solve the problems of inability to prepare stacked quantum dot light-emitting layers, achieve stable polychromatic light, reduce manufacturing processes, and expand options range effect

Active Publication Date: 2019-06-25
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a white light quantum dot light-emitting diode and its preparation method, aiming to solve the problem that the existing white light quantum dot light-emitting diode cannot be prepared by the solution method due to the interference of the solvent in the quantum dot solution to the lower quantum dot. Layer Quantum Dot Light-Emitting Layer Problems

Method used

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Embodiment approach

[0035] As an implementation, X2 -COOH, -OH, -CN, -NHCO-CH 3 , -NH 2 , -SH, -CHO, the replacement ligands formed can be understood as strong polar ligands, including but not limited to mercaptoacetic acid, 3-mercaptopropionic acid, 3-mercaptobutyric acid, 6-mercaptohexanoic acid, mercaptoethyl Amine, 3-mercaptopropylamine, 4-mercaptobenzoic acid, mercaptoglycerol, 1-trimethylamineethanethiol, mercaptoaniline, nitroaniline, sulfoaniline, aminobenzoic acid, 4-(diphenylphosphino) at least one of benzoic acids.

[0036] As another embodiment, X 2 -CO-, -COOR, -NO 2 , -O-, -O-CH 3 、-CH 3 When, the replacement ligands constituted can be understood as weak polar replacement ligands, including but not limited to octylamine, propylamine, hexadecylamine, 4-mercaptoanisole, 1-hydroxy-3-methoxy-propane at least one of . Of course, the embodiment of the present invention can also adjust the polarity of the replacement ligand by adjusting the carbon chain length of R. Specifically, th...

Embodiment 1

[0075] This embodiment provides a white light quantum dot light emitting diode and a preparation method thereof. The white light quantum dot light-emitting diode comprises a laminated and combined ITO glass, a PEDOT layer, a TFB layer, a CdSe red quantum dot light emitting layer, a CdSe green quantum dot light emitting layer, a CdSe blue light quantum dot light emitting layer, a ZnO layer and an Al layer. And the quantum dots in the surface layer of the CdSe red quantum dot light-emitting layer and the CdSe green quantum dot light-emitting layer are combined with 3-mercapto groups Propionic acid ligands, and cross-linking between adjacent 3-mercaptopropionic acid ligands.

[0076] The quantum dot light-emitting diode of this embodiment is prepared according to the following method:

[0077] S11. Dissolving 3-mercaptopropionic acid in ethanol to prepare a displacement ligand solution;

[0078] S12. Print the PEDOT hole injection layer, the TFB hole transport layer, and the fi...

Embodiment 2

[0083] This embodiment provides a white light quantum dot light emitting diode and a preparation method thereof. The white light quantum dot light-emitting diode comprises a laminated and combined ITO glass, a PEDOT layer, a TFB layer, a CdSe red quantum dot light emitting layer, a CdSe green quantum dot light emitting layer, a CdSe blue light quantum dot light emitting layer, a ZnO layer and an Al layer. And the quantum dots in the surface layer of the CdSe red quantum dot light-emitting layer and the CdSe green quantum dot light-emitting layer are combined with 3-mercapto groups on the quantum dots in the surface layer of the CdSe green quantum dot light-emitting layer and the CdSe blue quantum dot light-emitting layer. Propylamine ligands and propylamine ligands, and cross-linking between adjacent 3-mercaptopropylamine ligands, between propylamine ligands, and between 3-mercaptopropylamine ligands and propylamine ligands.

[0084] The quantum dot light-emitting diode of thi...

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Abstract

The invention provides a white-light quantum dot light-emitting diode. The white-light quantum dot light-emitting diode comprises a bottom electrode, a light-emitting layer and a top electrode, wherein the light-emitting layer is a laminated light-emitting layer, the laminated light-emitting layer includes N light-emitting films which are laminated and combined, the first to the (N-1)th light-emitting films are quantum dot light-emitting films, the Nth light-emitting film is a quantum dot light-emitting film or an organic light-emitting film, and N is a positive integer which is greater than or equal to 2; in two oppositely laminated and combined surfaces of the adjacent quantum dot light-emitting films, the surface of quantum dots contained at least in the surface layer of at least one surface is bound with a displacement ligand, the structural general formula of the displacement ligand is X1-R-X2, R is an alkyl or alkyl derivative, X1 is a functional group crosslinked with the quantum dot, X2 is a polarity regulating functional group, and the crosslinking activity of the X1 and the quantum dot is greater than the crosslinking activity of the X2 and the quantum dot.

Description

technical field [0001] The invention belongs to the technical field of flat panel display, and in particular relates to a white light quantum dot light-emitting diode 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, and has incomparable advantages over other light-emitting materials, such as Controllable 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. [0003] In general, the surface of quantum dots will be connected to organic ligands by means of chelation or other means to connect inorganic ligands by forming chemical bonds. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
Inventor 曹蔚然杨一行向超宇钱磊梁柱荣
Owner TCL CORPORATION
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