Color Conversion Characteristics of Micro-LED Based on Quantum Dot@Ordered Mesoporous Composite Materials

CHEN Xiaogang; ZHAO Mengyun; CAI Junhu; LI Gongming; ZHA Nan; YE Yun; XU Sheng; GUO Tailiang; CHEN Enguo

doi:10.37188/CJL.20230264

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Color Conversion Characteristics of Micro-LED Based on Quantum Dot@Ordered Mesoporous Composite Materials

Synthesis and Properties of Materials | 更新时间：2024-07-10

- Color Conversion Characteristics of Micro-LED Based on Quantum Dot@Ordered Mesoporous Composite Materials
  增强出版
- Chinese Journal of Luminescence Vol. 45, Issue 1, Pages: 59-68(2024)
- 作者机构：
  
  1.福州大学物理与信息工程学院，平板显示技术国家和地方联合工程实验室，福建福州　350108
  2.中国福建光电信息科学与技术创新实验室（闽都创新实验室），福建福州　350108
- 作者简介：
- 基金信息：
  
  National Key Research and Development Program(2022YFB3603503);National Natural Science Foundation of China(62175032);Regional Development Project of Fujian Province(2023H4004);Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China(2020ZZ111)
- DOI：10.37188/CJL.20230264
  CLC： O482.31
- Published：05 January 2024，
  
  Received：29 October 2023，
  
  Revised：14 November 2023，
- 稿件说明：
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陈晓钢,赵梦云,蔡俊虎等.基于量子点@有序介孔复合材料的Micro⁃LED色转换特性[J].发光学报,2024,45(01):59-68.

CHEN Xiaogang,ZHAO Mengyun,CAI Junhu,et al.Color Conversion Characteristics of Micro-LED Based on Quantum Dot@Ordered Mesoporous Composite Materials[J].Chinese Journal of Luminescence,2024,45(01):59-68.
陈晓钢,赵梦云,蔡俊虎等.基于量子点@有序介孔复合材料的Micro⁃LED色转换特性[J].发光学报,2024,45(01):59-68. DOI： 10.37188/CJL.20230264.

CHEN Xiaogang,ZHAO Mengyun,CAI Junhu,et al.Color Conversion Characteristics of Micro-LED Based on Quantum Dot@Ordered Mesoporous Composite Materials[J].Chinese Journal of Luminescence,2024,45(01):59-68. DOI： 10.37188/CJL.20230264.

摘要

量子点（Quantum dots）由于具有优异的光电特性，广泛应用于发光与显示、太阳能电池、光催化等领域，它的发现和合成获得了2023年诺贝尔化学奖。采用量子点色转换的Micro⁃LED全彩化显示技术无需巨量转移，有望实现大规模量产，然而，量子点在高强度Micro⁃LED出光激发下的性能和寿命仍存在局限。基于此，本文研究了基于量子点@有序介孔（QDs@SBA⁃15）复合材料的Micro⁃LED色转换技术及其特性，有序介孔分子筛载体独特的孔道结构不仅能够有效提升Micro⁃LED色转换和光提取效率，且致密的有序介孔材料也一定程度上保障了量子点的稳定性。首先，通过时域有限差分方法（FDTD）建立了Micro⁃LED仿真模型，探究量子点粒径和有序介孔材料的孔径对光提取效率的影响；基于仿真结果指导，进一步采用物理共混法制备了QDs@SBA⁃15复合材料，通过透射光谱、荧光激发光谱、紫外⁃可见光吸收谱等手段对其进行表征并确定浓度配比；最后，将该复合材料与聚二甲基硅氧烷（PDMS）混合固化成膜，并研究了其光致发光性能。实验结果发现，量子点粒径和介孔材料孔径的匹配度以及量子点和有序介孔材料的比例浓度是影响QDs@SBA⁃15复合材料发光效率及Micro⁃LED色转换性能的关键因素；通过优化，所得复合材料可获得优异的发光性能以及良好的环境稳定性，相比于纯量子点色转换层，复合材料的光提取效率提升了81.73%，复合材料的环境稳定性提升了14.33%，以Micro⁃LED作为蓝光光源组成的三基色发光器件工作色域达到了104.52% NTSC。本研究为量子点色转换Micro⁃LED显示技术提供了理论指导，为实现Micro⁃LED全彩化开辟了新路径。

Abstract

Quantum dots（QDs）are widely used in luminescence and display， solar cells， photocatalysis and other fields due to their excellent photovoltaic properties， and its discovery and synthesis won the 2023 Nobel Prize in Chemistry. Micro-LED full-color display technology using quantum dot color conversion does not require mass transfer technology and is expected to achieve large-scale mass production. However， there are still limitations to the performance and lifespan of quantum dots under intense Micro-LED light excitation. Based on， this paper studies the Micro-LED color conversion technology and its characteristics based on quantum dot@ordered mesoporous （QDs@SBA-15） composite materials. The unique pore structure of the ordered mesoporous materials not only can effectively improve the Micro-LED color conversion and light extraction efficiency， but also the dense ordered mesoporous material guarantees the stability of the quantum dots to a certain extent. Firstly， we established a Micro-LED simulation model through the Finite-difference time-domain（FDTD） method to investigate the effects of the particle size of the quantum dots and the pore size of the ordered mesoporous materials on the light extraction efficiency. Based on the guidance of simulation results， QDs@SBA-15 composites were further prepared by physical blending method， characterized by transmission spectroscopy， fluorescence excitation spectroscopy and UV-Vis absorption spectroscopy， and the concentration ratios were determined. Finally， we combined this composite material with polydimethylsiloxane （PDMS） to solidify it into a film and studied its photoluminescence performance. The experimental results showed that the matching degree of the quantum dot particle size and the pore diameter of the mesoporous material， as well as the concentration ratio of quantum dots and ordered mesoporous materials， is crucial to the luminous efficiency of QDs@SBA-15 composite materials and the color conversion performance of Micro-LED. Through the optimization， the resulting composites can obtain excellent luminescence performance and good environmental stability， compared with the pure quantum dots color conversion layer， the light extraction efficiency of the composite material has been improved by 81.73%， and the environmental stability of the composite material has been improved by 14.33%. The color gamut of tri-color devices obtained with Micro-LED as the blue light source reached 104.52% NTSC. This research provides theoretical guidance for quantum dot color conversion Micro-LED display technology， and opens up a new path to realize the full-color Micro-LED.

关键词

量子点有序介孔材料色转换Micro-LED

Keywords

quantum dotsordered mesoporous materialscolor conversionMicro-LED

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