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TADF (Thermally Activated Delayed Fluorescence) polymer ligand and quantum dot material and preparation methods and application thereof

A polymer and quantum dot technology, which is applied in chemical instruments and methods, luminescent materials, semiconductor/solid-state device manufacturing, etc., can solve the problems of limited use of cadmium-based quantum dot materials, high cytotoxicity, and adverse effects on QLED luminescent display performance. , to achieve the effect of improving electroluminescence efficiency

Active Publication Date: 2019-01-11
BOE TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cytotoxicity of cadmium-based quantum dot materials is relatively high, so there are strict restrictions on the use of cadmium-based quantum dot materials, and it is difficult to be used commercially
However, if cadmium-free quantum dot materials such as indium phosphide (InP) and copper indium sulfur (CuInS2) are used to make the QLED quantum dot light-emitting layer, it is easy for holes and electrons to pass through the QLED quantum dots made of cadmium-free quantum dot materials. The problem of effective recombination in the light-emitting layer leads to poor electroluminescence efficiency of the QLED quantum dot light-emitting layer, which adversely affects the light-emitting display performance of QLED

Method used

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  • TADF (Thermally Activated Delayed Fluorescence) polymer ligand and quantum dot material and preparation methods and application thereof
  • TADF (Thermally Activated Delayed Fluorescence) polymer ligand and quantum dot material and preparation methods and application thereof
  • TADF (Thermally Activated Delayed Fluorescence) polymer ligand and quantum dot material and preparation methods and application thereof

Examples

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preparation example Construction

[0043] The embodiment of the present invention also provides a preparation method of the TADF polymer ligand, which is used for preparing the above-mentioned TADF polymer ligand. see image 3 , the preparation method comprises:

[0044] Step S1, prepare main chain compound, TADF compound and quantum dot coordination compound respectively.

[0045] The main chain compound and the quantum dot coordination compound can be prepared and synthesized according to their respective structural compositions, and the specific preparation methods are not limited in this embodiment. The TADF compound contains the TADF active group provided in the above examples, and its preparation method is related to the specific structure of the TADF active group.

[0046] In the above embodiments, the TADF active group 2 generally includes an electron-donating group and an electron-withdrawing group connected to the electron-donating group; the electron-donating group generally adopts an aromatic grou...

Embodiment 1

[0081] In this example, the molecular structure of the TADF polymer ligand is as follows:

[0082]

[0083] The molecule is a random copolymer, and its polymer main chain adopts a polyethylene main chain; the TADF active group adopts a phenoxazine-triazine-phenoxazine structure, and its unit number is p; the quantum dot coordination group adopts a carboxyl group , the number of units is n; the solubilizing group includes carboxyoctyl and octyl for solubilization, and the number of units is m. The carboxyoctyl group of the solubilizing group adopts a long chain structure, and its long chain has a solubilizing effect, and its carboxyl group can coordinate with the quantum dots at the same time.

[0084] The above-mentioned TADF polymer ligand is synthesized by the following method:

[0085] Step 1, dissolve 10mmol p-bromoxynil in 50mmol trifluoromethanesulfonic acid, and react at 60°C for 12 hours; after the reaction is completed, pour the reactant into water, and wash out t...

Embodiment 2

[0100] In this example, the molecular structure of the TADF polymer ligand is as follows:

[0101]

[0102] The molecule is a random copolymer, and its polymer main chain adopts a main chain containing alkenyl, phenyl and carbazole; the TADF active group adopts a carbazole-sulfone group-carbazole structure, and its unit number is p; quantum dots The coordinating group is aminomethyl, and its unit number is m; the solubilizing group is butoxy group, and adopts a long-chain structure, its unit number is n, and its long chain has a solubilizing effect.

[0103] The above-mentioned TADF polymer ligand is synthesized by the following method:

[0104] Step 1, 10 mmol carbazole was dissolved in 50 mmol chloroform, 60 mmol aluminum trichloride was added, and 25 mmol tert-butyl chloride was added dropwise in an ice-water bath, and the reaction was carried out by reflux for 12 hours. After the reaction is finished, pour the reactants into water, extract and evaporate to dryness to o...

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Abstract

The embodiment of the invention discloses a TADF (Thermally Activated Delayed Fluorescence) polymer ligand, a quantum dot material, preparation methods and application thereof, and relates to the technical field of the quantum dot material. The TADF polymer ligand is used for improving the electroluminescence efficiency of the quantum dot material and comprises a polymer main chain, a TADF activegroup and a quantum dot coordinating group which are grafted on the polymer main chain; the TADF active group comprises an electron-donating group and an electron withdrawing group which is connectedto the electron-donating group; and the electron-donating group comprises an aromatic group. The quantum dot material comprises quantum dots and the TADF polymer ligand as described above which is bonded to the surface of the quantum dot. The TADF polymer ligand and quantum dot material provided by the embodiment of the invention are used for the quantum dot light-emitting layers of QLED (QuantumDot Light Emitting Diodes).

Description

technical field [0001] The invention relates to the technical field of quantum dot materials, in particular to a TADF polymer ligand, a quantum dot material, a preparation method and application thereof. Background technique [0002] With the development of display technology, quantum dot electroluminescent devices (Quantum Dot Light Emitting Diodes, referred to as QLEDs) have gradually become an One of the mainstream development directions of display technology in the future. [0003] At present, the light emission of QLED is mainly realized in two ways, one is direct carrier injection light emission, that is, holes are injected from the QLED hole transport layer to the QLED quantum dot light emitting layer, and electrons are injected from the QLED electron transport layer to the QLED. Quantum dot light-emitting layer, where holes and electrons recombine into excitons in the QLED quantum dot light-emitting layer; another way is energy transfer light emission, that is, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/04C08F220/06C08F212/32C08G61/12H01L51/50H01L51/54H10K99/00
CPCC08F212/32C08F220/04C08F220/06C08G61/124C08G2261/3424C08G2261/122C08G2261/1412C08G2261/1424C08G2261/143C08G2261/3241H10K85/111H10K85/151H10K50/115C09K11/06H10K85/141H10K85/654H10K2101/20C09K2211/1059H10K50/11H10K85/6572H10K2101/10
Inventor 张振琦
Owner BOE TECH GRP CO LTD
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