Water-driven Photoluminescence Reversibility in CdSe/CdS Quantum Dots Polymer Composite

Jun-hu CAI; Chen-hui WANG; Xin-pei HU; En-guo CHEN; Sheng XU; Yun YE; Tai-liang GUO

doi:10.37188/CJL.20210401

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Water-driven Photoluminescence Reversibility in CdSe/CdS Quantum Dots Polymer Composite

Synthesis and Properties of Materials | 更新时间：2022-05-23

- Water-driven Photoluminescence Reversibility in CdSe/CdS Quantum Dots Polymer Composite
  增强出版
- Chinese Journal of Luminescence Vol. 43, Issue 5, Pages: 714-724(2022)
- 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 Natural Science Foundation of China(62175032);Fujian Provincial Natural Science Foundation Project(2021J01579);Fujian Provincial key science and technology Project(2021HZ021001);Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China(2020ZZ111)
- DOI：10.37188/CJL.20210401
  CLC： O482.31
- Received：28 December 2021，
  
  Revised：15 January 2022，
  
  Published：2022-05
- 稿件说明：
移动端阅览
Jun-hu CAI, Chen-hui WANG, Xin-pei HU, et al. Water-driven Photoluminescence Reversibility in CdSe/CdS Quantum Dots Polymer Composite[J]. Chinese journal of luminescence, 2022, 43(5): 714-724.
DOI：

Jun-hu CAI, Chen-hui WANG, Xin-pei HU, et al. Water-driven Photoluminescence Reversibility in CdSe/CdS Quantum Dots Polymer Composite[J]. Chinese journal of luminescence, 2022, 43(5): 714-724. DOI： 10.37188/CJL.20210401.

摘要

量子点由于其优异的光学和电学特性，在新型光电器件领域是一种极具前景的明星材料。本文通过将核壳CdSe/CdS量子点封装到聚二甲基硅氧烷-聚脲（PDMS-PUa）聚合物基质中制备CdSe/CdS@PDMS-PUa复合材料，发现了其光致发光强度和荧光量子产率的水致增强现象，经荧光衰减曲线和漫反射光谱分析，解释了该现象是来自于水中的H

和OH

对量子点表面缺陷的有效钝化，使得量子点的晶胞更趋于理想化。进一步通过实验发现，当复合材料从水中取出干燥后，由于量子点表面缺陷态又重新暴露，光致发光强度和荧光量子产率又恢复到初始值。受所发现的荧光可逆现象的启发，本文基于CdSe/CdS@PDMS-PUa复合材料提出了一种具有荧光响应的液体高度传感器，通过荧光亮度的变化可以判断容器内液体的高度值。这些发现不仅揭示了CdSe/CdS量子点水致荧光可逆特性，同时拓宽了量子点聚合物复合材料在光电领域的应用，具有重要的科学意义和应用前景。

Abstract

Quantum dots are a promising star material in the field of new optoelectronic devices due to their excellent optical and electrical properties. In this work

we prepare the CdSe/CdS@PDMS-PUa composite by encapsulating core/shell CdSe/CdS quantum dots into an amino-terminated polydimethylsiloxane(PDMS-PUa) polymer matrix

which shows water-driven enhanced photoluminescence(PL) intensity and photoluminescence quantum yield(PLQY). After the analysis of fluorescent decay curve and diffuse reflectance spectrum

the reason for this enhancement is found to be the passivation of the surface defects of the quantum dots by H

and OH

in water

making the unit cell of the quantum dots more idealized. However

when the composite is taken out of the water for drying

the defect states are exposed again

and both PL and PLQY return to their original values. Inspired by the water-driven PL reversibility in CdSe/CdS@PDMS-PUa composite

a liquid height sensor with fluorescence response is proposed based on the CdSe/CdS@PDMS-PUa composite

which can judge the liquid height value in the container through the change of fluorescence intensity. These findings not only reveal the reversible characteristics of CdSe/CdS quantum dots

but also broaden the application of quantum dots polymer composites in the field of optoelectronics

which has important scientific significance and application prospects.

关键词

Keywords

references

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