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Room temperature synthesis of stable silica-coated CsPbBr3 quantum dots for amplified spontaneous emission

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Abstract

All-inorganic cesium lead bromide (CsPbBr3) perovskite quantum dots (QDs) with excellent optical properties have been regarded as good gain materials for amplified spontaneous emission (ASE). However, the poor stability as the results of the high sensitivity to heat and moisture limits their further applications. Here, we report a facile one-pot approach to synthesize CsPbBr3@SiO2 QDs at room temperature. Due to the effective defects passivation using SiO2, as-prepared CsPbBr3@SiO2 QDs present an enhanced photoluminescence quantum yield (PLQY) and chemical stability. The PLQY of CsPbBr3@SiO2 QDs reaches 71.6% which is higher than 46% in pure CsPbBr3 QDs. The PL intensity of CsPbBr3@SiO2 QDs maintains 84% while remaining 24% in pure CsPbBr3 after 80 min heating at 60°C. The ASE performance of the films is also studied under a two-photon-pumped laser. Compared with the films using pure CsPbBr3 QDs, those with as-prepared CsPbBr3@SiO2 QDs exhibit a reduced threshold of ASE. The work suggests that room-temperature-synthesized SiO2-coated perovskites QDs are promising candidates for laser devices.

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DOI:10.1364/PRJ.399845

所属栏目:Optical and Photonic Materials

基金项目:National Natural Science Foundation of China10.13039/501100001809; Fundamental Research Funds for the Central Universities10.13039/501100012226; National Key Research and Development Program of China10.13039/501100012166; Strategic Priority Research Program of CAS; CAS Interdisciplinary Innovation Team, Program of Shanghai Academic/Technology Research Leader;

收稿日期:2020-06-10

录用日期:2020-08-03

网络出版日期:2020-08-10

作者单位    点击查看

Qionghua Mo:Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
Tongchao Shi:State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Wensi Cai:Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
Shuangyi Zhao:Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
Dongdong Yan:Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
Juan Du:State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China;e-mail: dujuan@mail.siom.ac.cn
Zhigang Zang:Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China;e-mail: zangzg@cqu.edu.cn

联系人作者:Shuangyi Zhao(shyzhao@cqu.edu.cn)

备注:National Natural Science Foundation of China10.13039/501100001809; Fundamental Research Funds for the Central Universities10.13039/501100012226; National Key Research and Development Program of China10.13039/501100012166; Strategic Priority Research Program of CAS; CAS Interdisciplinary Innovation Team, Program of Shanghai Academic/Technology Research Leader;

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引用该论文

Qionghua Mo, Tongchao Shi, Wensi Cai, Shuangyi Zhao, Dongdong Yan, Juan Du, and Zhigang Zang, "Room temperature synthesis of stable silica-coated CsPbBr3 quantum dots for amplified spontaneous emission," Photonics Research 8(10), 1605-1612 (2020)

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