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Nanoparticle, display substrate preparation method and display device

A nanoparticle and nanoparticle technology, applied in the field of display, can solve the problems of QLED not reaching the mass production level, high resolution, performance impact of nanoparticles, etc., achieve better display performance, improve resolution, and avoid photobleaching.

Active Publication Date: 2019-02-22
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production efficiency of QLED has not yet reached the level of mass production. The most important reason is that the high-resolution patterning technology of QLED has not yet achieved a breakthrough.
[0004] When producing patterned nanoparticles similar to quantum dots in the prior art, due to the inorganic nanoparticle characteristics of nanoparticles, patterned nanoparticles cannot be produced by evaporation and patterning.
[0005] The existing technology generally produces patterned nanoparticles by inkjet printing, but it is difficult to achieve high resolution with this method
In the prior art, in order to improve the resolution of the product, photolithography is used to produce patterned nanoparticles. Since the photolithography includes an exposure process, the exposure process is likely to affect the performance of the nanoparticles.

Method used

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  • Nanoparticle, display substrate preparation method and display device

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preparation example Construction

[0039] When the nanoparticles are quantum dots, the preparation method of the quantum dots comprises the following steps:

[0040] S1: contacting the quantum dot raw material with pyridine to obtain the quantum dot with pyridine on the surface;

[0041] S2: Contacting the quantum dots with pyridine on the surface with the first ligand and the second ligand to obtain the quantum dots described in the above technical solution; wherein the first ligand has alkali solubility, and the second ligand is heated Cross-linking can then occur.

[0042] In some embodiments, the S1 is performed as follows:

[0043] The quantum dot raw material and pyridine (as a solvent) are contacted at room temperature and pressure for 5 minutes to 10 hours with stirring at a weight ratio greater than 1:1, and then the quantum dots with pyridine on the surface are separated by centrifugal separation.

[0044] In some embodiments, the quantum dot raw material carries at least one ligand selected from th...

Embodiment 1

[0104] 1. Using CdTe as the core, quantum dots were prepared by ligand exchange method.

[0105] 2. Prepare or purchase CdTe quantum dots whose ligand is trioctyl oxon or oleic acid.

[0106] 3. Add the CdTe quantum dots whose ligand is trioctylphosphine or oleic acid to 100 mL of pyridine, stir for 1 hour, concentrate the solution, and add ethanol to precipitate the quantum dots. Centrifuge and collect the precipitate, at this time the surface ligands of the CdTe quantum dots are replaced by pyridine.

[0107] 4. Redissolve the precipitate in toluene and add excess primary ligand and the second ligand

[0108]The molar ratio of the first ligand to the second ligand is 8:2. After stirring for 1 hour, methanol is added to precipitate the quantum dots whose ligands have been converted into the first ligand and the second ligand structure. The lower precipitate obtained after centrifugation is the desired quantum dot. Quantum dots can be preserved in toluene or n-hexane af...

Embodiment 2

[0110] 1. Spin-coat a layer of 35nm red quantum dots on the substrate.

[0111] 2. Spin-coat photoresist (positive resist) on the red quantum dot layer, and then perform pre-baking and exposure.

[0112] 3. Developing; during the developing process, the exposed positive resist is removed, the quantum dots under it lose the protection of the photoresist, and part of the ligand reacts with an alkaline developer (such as TMAH aqueous solution) to become water-soluble, thereby This part of the red quantum dots is dissolved in the developer and detached from the substrate; the nanoparticles that need to be left are protected by the photoresist and remain on the substrate.

[0113] 4. Post-baking, so that the red quantum dots still protected by the photoresist are thermally cross-linked, thereby fixing the red quantum dots on the substrate.

[0114] 5. Soak in the stripping solution to remove the photoresist to complete the patterning of the red quantum dots.

[0115] 6. Spin-coat...

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Abstract

The present invention relates to the field of display, and in particular to a nanoparticle, a display substrate preparation method, and a display device. The nanoparticle comprise a nanoparticle body,and first ligands and a second ligands connected to a surface of the nanoparticle body, wherein the first ligands have alkaline solubility, and the second ligands are crosslinked upon exposure to heat. The display substrate preparation method includes: forming a nanoparticle layer on the substrate; coating the nanoparticle layer with the photoresist, and exposing the photoresist by using a mask after the pre-baking treatment; performing development processing, wherein the photoresist in the the nano-particle layer unretained area is completely removed, and the exposed nanoparticle layer is dissolved in a developing solution; subjecting the second ligands of the nanoparticle covered by the photoresist retention region to a crosslinking reaction after the post-baking treatment, and fixing the nanoparticle layer on the substrate; stripping the photoresist to complete patterning of the nanoparticle layer. The nanoparticle can be combined with a photolithography process to achieve high resolution of nanoparticle patterning.

Description

technical field [0001] The invention relates to the display field, in particular to a nano particle, a preparation method of a display substrate and a display device. Background technique [0002] Quantum Dots (QDs), also known as nanocrystals, are nanoparticles composed of II-VI or III-V elements. The particle size of quantum dots is generally between 1 and 20 nm. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a discrete energy level structure, which can emit fluorescence after being excited. [0003] With the in-depth development of quantum dot preparation technology, the stability and luminous efficiency of quantum dots have been continuously improved, and the research on quantum dot light-emitting diodes (Quantum Light Emitting Diode, QLED) has continued to deepen, and the application prospects of QLED in the display field have become increasingly bright. However, the production efficiency of QLED has not yet reached the lev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56B82Y30/00H10K99/00
CPCB82Y30/00H10K50/115C09K11/025C09K11/883G03F7/11G03F7/0007B82Y20/00B82Y40/00G03F7/168H10K59/12H10K71/00H10K71/40H10K71/233H10K85/615H10K85/653
Inventor 陈卓梅文海
Owner BOE TECH GRP CO LTD
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