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Linear and nonlinear photophysical properties of ZnSe/CdS/ZnS core/shell/shell type II nanocrystals

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Abstract

In this work, one kind of type II ZnSe/CdS/ZnS core/shell/shell nanocrystals (NCs) is synthesized, and their linear and nonlinear photophysical properties are investigated. Through measurements of the temperature-dependent photoluminescence spectra of NCs, their excitonic properties, including the coefficient of the bandgap change, coupling strength of the exciton acoustic phonons, exciton longitudinal optical (LO) phonons, and LO–phonon energy are revealed. Femtosecond transient absorption spectroscopy was employed to obtain insight into ultrafast processes occurring at the interface of ZnSe and CdS, such as those involving the injection of photo-induced electrons into the CdS shell, interfacial state bleaching, and charge separation time. At the end, their multiphoton absorption spectra were determined by using the z-scan technique, which yielded a maximum two-photon absorption cross section of 3717 GM at 820 nm and three-photon absorption cross section up to 3.9×10?77 cm6·s2·photon?2 at 1220 nm, respectively. The photophysical properties presented here may be important for exploiting their relevant applications in optoelectronic devices and deep-tissue bioimaging.

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DOI:10.1364/PRJ.387099

所属栏目:Optical and Photonic Materials

基金项目:Natural Science Foundation of Guangdong Province10.13039/501100003453; Department of Education of Guangdong Province10.13039/501100010226;

收稿日期:2020-01-02

录用日期:2020-06-26

网络出版日期:2020-06-30

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Yang Gao:College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Xin Qiu:College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Fuli Zhao:Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China;College of Arts and Science, Shanghai Dianji University, Shanghai 201306, China
Shuyu Xiao:College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Junzi Li:College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Xiaodong Lin:College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Rui Chen:Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China;e-mail: chenr@sustech.edu.cn
Tingchao He:College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;e-mail: tche@szu.edu.cn

联系人作者:Rui Chen(chenr@sustech.edu.cn); Tingchao He(tche@szu.edu.cn);

备注:Natural Science Foundation of Guangdong Province10.13039/501100003453; Department of Education of Guangdong Province10.13039/501100010226;

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引用该论文

Yang Gao, Xin Qiu, Fuli Zhao, Shuyu Xiao, Junzi Li, Xiaodong Lin, Rui Chen, and Tingchao He, "Linear and nonlinear photophysical properties of ZnSe/CdS/ZnS core/shell/shell type II nanocrystals," Photonics Research 8(9), 1416-1421 (2020)

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