Stability enhancement of green CdSe/ZnS quantum dot diffuser plates via inorganic oxides coating

LI Min

doi:10.37188/CJLCD.2025-0154

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Stability enhancement of green CdSe/ZnS quantum dot diffuser plates via inorganic oxides coating

Quantum Dot Luminescent Materials | 更新时间：2026-09-12

- Stability enhancement of green CdSe/ZnS quantum dot diffuser plates via inorganic oxides coating
- Chinese Journal of Liquid Crystals and Displays Vol. 41, Issue 1, Pages: 55-64(2026)
- 作者机构：
  
  闽都创新实验室，福建福州 350108
- 作者简介：
- 基金信息：
  
  The Collaborative Innovation Platform Project for Quantum Dot New Display Technology in the Fuzhou-Xiamen-Quanzhou National Independent Innovation Demonstration Zone(2023-P-010)
- DOI：10.37188/CJLCD.2025-0154
  CLC： O482.31
- CSTR：32172.14.CJLCD.2025-0154
- Received：06 August 2025，
  
  Revised：2025-10-12，
  
  Published：05 January 2026
- 稿件说明：
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LI Min. Stability enhancement of green CdSe/ZnS quantum dot diffuser plates via inorganic oxides coating[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(1): 55-64.
DOI：

LI Min. Stability enhancement of green CdSe/ZnS quantum dot diffuser plates via inorganic oxides coating[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(1): 55-64. DOI： 10.37188/CJLCD.2025-0154. CSTR： 32172.14.CJLCD.2025-0154.

摘要

为了提升绿光CdSe/ZnS量子点在显示应用中的光学稳定性，克服其在扩散板中易受环境影响，如水、氧气等，以及聚合物与量子点不相容使得量子点表面配体脱落而导致发光效率下降的问题，本研究探索更加有效的保护策略，增强其在蓝光激发下的光稳定性和湿热稳定性。本研究首先采用微乳液法、Stöber法在绿光量子点表面制备了QD@SiO

包覆层，采用溶胶-凝胶法在量子点表面制备了QD@AlO

包覆层；然后，对制备的QD@SiO

和QD@AlO

进行了形貌、结构及光致发光（PL）稳定性等方面的表征与测试；最后，将这两种量子点复合材料分别制成绿光量子点扩散板，并在蓝光（200 mW/cm

）和湿热蓝光（50 ℃/90% RH，5 000 cd/m

蓝光）条件下进行老化测试，评估其在显示应用中的光稳定性和湿热稳定性表现。实验结果表明，所制备的QD@SiO

和QD@AlO

在蓝光激发下均表现出优异的光学稳定性。其中，AlO

保护层因其具有更小的比表面积和孔容使其在湿热老化测试中具有更好的稳定性，能够有效抑制量子点发光效率的衰减。本研究通过两种表面包覆方法有效增强了绿光量子点的环境稳定性，基本满足显示器件对高光稳定性和湿热耐受性的要求，为高性能量子点器件的开发提供了理论基础和实践方案。

Abstract

This study aims to enhance the optical stability of CdSe/ZnS green quantum dots（QDs） in display applications by addressing their susceptibility to environmental factors， including moisture， oxygen， and incompatibility with polymers， which may result in ligand desorption and a decrease in luminescence efficiency. The more effective protection strategies were explored to improve their photostability and humid-thermal stability under blue light excitation. The QD@SiO

coating layer was prepared on the surface of green QDs by microemulsion method and Stöber method， respectively. The QD@AlO

coating layer was prepared by sol-gel method. Then， the morphology， structure， and photoluminescence（PL） stability of the prepared QD@SiO

and QD@AlO

were characterized. Finally， these two types of QD composite were respectively fabricated into green QD diffuser plates， which were subjected to aging tests under blue light （200 mW/cm²） and humid-thermal blue light conditions

（50 ℃/90% RH， 5 000 cd/m

blue light） to assess their photostability and humid-thermal stability in display applications. Experimental results demonstrated that both the prepared QD@SiO

and QD@AlO

exhibited excellent optical stability under blue light excitation. Among them， the AlO

protective layer has better stability in the humid-thermal aging tests due to its smaller specific surface area and pore volume， and can effectively suppress the attenuation of the photoluminescence efficiency of QDs. This study effectively enhanced the environmental stability of green QDs through two surface coating methods， meeting the essential requirements of display devices for high photostability and humid-thermal stability tolerance. It provides a theoretical basis and practical solution for the development of high-performance QD devices.

关键词

Keywords

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