Simultaneous enhancements on emissions from quantum dot and quantum well by Ag nanoparticles for color conversion

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-03-11 DOI:10.1088/1361-6641/ad3275

C. Deng, Zhizhong Chen, Yifan Chen, Qian Sun, J. Nie, Z. Pan, Haodong Zhang, Boyan Dong, Yian Chen, Daqi Wang, Yuchen Li, Weihua Chen, Xiangning Kang, Qi Wang, Guoyi Zhang, B. Shen, Huijuan Wang, Fei Wang, Wei Wang, Zhongxiao Li

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Abstract

Quantum dots (QDs) have been paid much attention on the color conversion for light-emitting diode (LED) in micro-display recently. However, it is hard to achieve high color conversion efficiency in a thin QD layer. In this paper, we fabricated silver nanoparticles (Ag NPs) with radii ranging mostly from 25 to 35 nm on a blue LED with a peak wavelength of 450 nm, then spin-coated QDs with a peak wavelength of 565 nm. Scanning electron microscopy (SEM), cathodoluminescence (CL), photoluminescence (PL), and time-resolved PL (TRPL) measurements were performed. The PL emissions from quantum wells (QWs) of blue LED and QDs were enhanced by 10% and 32%, respectively, when the Ag NPs were included. The PL lifetimes of QWs and QDs were reduced by 10 and 6 times, respectively, compared to their initial states. Finite Difference Time Domain (FDTD) software and the perturbation method were used to simulate the PL measurements and variable separation. It was concluded that the coupling of QDs and QWs with localized surface plasmon (LSP) improves the external quantum efficiency (EQE) and enhances the spontaneous emission rate in both QWs and QDs. This paper provides a new idea for designing high-efficiency color conversion micro-LED.

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银纳米粒子同时增强量子点和量子阱的发射，实现色彩转换

近年来，量子点（QDs）在微型显示器发光二极管（LED）色彩转换方面受到广泛关注。然而，要在较薄的 QD 层中实现较高的色彩转换效率并不容易。在本文中，我们在峰值波长为 450 nm 的蓝光 LED 上制造了半径大多在 25 到 35 nm 之间的银纳米粒子（Ag NPs），然后旋涂了峰值波长为 565 nm 的 QDs。测量结果包括扫描电子显微镜（SEM）、阴极射线发光（CL）、光致发光（PL）和时间分辨光致发光（TRPL）。加入 Ag NPs 后，蓝光 LED 量子阱（QWs）和 QDs 的 PL 发射分别增强了 10%和 32%。与初始状态相比，QWs 和 QDs 的聚光寿命分别缩短了 10 倍和 6 倍。使用有限差分时域（FDTD）软件和扰动法模拟了 PL 测量和可变分离。结果表明，QDs 和 QWs 与局部表面等离子体（LSP）的耦合提高了外部量子效率（EQE），并增强了 QWs 和 QDs 的自发辐射率。本文为设计高效色彩转换微型 LED 提供了新思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.