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Composite material, preparation method thereof and light-emitting diode

A technology of composite materials and luminescent materials, which is applied in the field of display materials and can solve problems such as low energy transfer efficiency

Pending Publication Date: 2021-07-16
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 composite material and its preparation method, aiming to solve the technical problem of low energy transfer efficiency between the host organic light-emitting material and the guest quantum dot material

Method used

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  • Composite material, preparation method thereof and light-emitting diode
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  • Composite material, preparation method thereof and light-emitting diode

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preparation example Construction

[0024] On the one hand, the embodiment of the present invention provides a kind of preparation method of composite material, such as figure 1 Shown, this preparation method comprises the steps:

[0025] S01: adding the host organic light-emitting material into the solution containing the guest quantum dot material, and performing heat treatment to obtain the composite material;

[0026] Wherein, the host organic luminescent material is connected with a chemical functional group, and the chemical functional group is a binding group combined with the guest quantum dot material.

[0027] In the prior art, the host luminescent material and guest quantum dots are used as the luminescent layer. The host and guest are directly mixed. Since the surface of the quantum dots is generally attached with a layer of insulating organic ligands (ie, the initial ligands), this layer of ligands The physical length is about 0.5-1nm, which greatly exceeds the contact distance between the host and...

Embodiment 1

[0059] A kind of preparation method of composite material:

[0060] The guest quantum dots are CdZnSe / ZnSe / ZnS, and the host for ligand exchange is carboxylated anthracenyl molecules (named host A) As an example; specific steps include:

[0061] Add 20ml of host A material (concentration: 10mg / ml) to 50.0ml (concentration: 5mg / ml) of n-octane solution of CdZnSe / ZnSe / ZnS quantum dots. The mixture was stirred at room temperature for 20 minutes to 2 hours. Add 25-100ml of precipitant (ethanol) to the reaction solution to precipitate the composite material from the solution, and then separate the precipitated composite material to the bottom of the solution by spinning at 5000-7000 rpm, pour the supernatant and then add benign Solvent (n-octane). The washing step was repeated 2-3 times for better purification of the composite.

Embodiment 2

[0063] A kind of preparation method of composite material:

[0064] The guest quantum dots are CdZnSe / ZnSe / ZnS, and the host for ligand exchange is an aminated TADF material molecule (named host B) As an example; specific steps include:

[0065] Add 20ml of host B material (concentration: 10mg / ml) to 50.0ml (concentration: 5mg / ml) of n-octane solution of CdZnSe / ZnSe / ZnS quantum dots. The mixture was stirred at room temperature for 20 minutes to 2 hours. 25-100ml of precipitating agent (ethanol) is added to the reaction solution, the composite material is precipitated from the solution, and then the precipitated composite material is separated to the bottom of the solution by spinning at 5000-7000 rpm. After pouring the supernatant, add a benign solvent (n-octane). The washing step was repeated 2-3 times for better purification of the composite.

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Abstract

The invention belongs to the technical field of display materials, and particularly relates to a composite material, a preparation method thereof and a light-emitting diode. The composite material comprises a guest quantum dot material and a host organic light-emitting material; and the host organic light-emitting material is connected with a chemical functional group, and the host organic light-emitting material is combined with the surface of the guest quantum dot material through the chemical functional group. According to the composite material provided by the invention, the host organic light-emitting material is attached to the surface of the quantum dot in a ligand manner and in a chemical bond manner, so that the distance between the host and the guest can be greatly shortened, the energy transfer efficiency is improved, the composite material is applied to a light-emitting layer of a light-emitting diode, the light-emitting performance of a device is finally improved, and the service life of the device is finally prolonged.

Description

technical field [0001] The invention belongs to the technical field of display materials, and in particular relates to a composite material, a preparation method thereof and a light emitting diode. Background technique [0002] In order to solve the problem of self-quenching of light-emitting materials and the problem of mobility difference between electrons and holes in the light-emitting layer, organic light-emitting diodes (OLEDs) generally adopt the technology of mixing host materials and guest materials. The host material accounts for the main part in the composition ratio, while the guest material is the minor part. The host material is mainly responsible for the transport and recombination of carriers to form excitons, while the excitons are transferred to the guest material through energy transfer, and the guest material recombines and releases photons through radiation relaxation, and finally achieves the electroluminescent state. Purpose. [0003] OLED traditiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88C09K11/06H01L51/50H01L51/54B82Y20/00B82Y30/00
CPCC09K11/02C09K11/883C09K11/06B82Y20/00B82Y30/00C09K2211/1007C09K2211/1011C09K2211/1059C09K2211/1029H10K85/615H10K85/626H10K85/654H10K85/6572H10K50/115
Inventor 刘文勇谭甲辉李哲杨一行
Owner TCL CORPORATION
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