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

Gao, Yang1; Qiu, Xin1; Zhao, Fuli2,3; Xiao, Shuyu1; Li, Junzi1; Lin, Xiaodong1; Chen, Rui2; He, Tingchao1

2020-09

10.1364/PRJ.387099

Photonics Research   影响因子和分区

2327-9125

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 photoinduced electrons into the CAS 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 x 10(-77) cm(6) . s(2). 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. (C) 2020 Chinese Laser Press

SCI ; EI

英语

通讯

Natural Science Foundation of Guangdong Province[2018A030310637][2019A1515012094] ; Department of Education of Guangdong Province[2018KTSCX19]

Optics

Optics

WOS:000565856300006

OPTICAL SOC AMER

20203609135436

Optoelectronic devices ; Absorption spectroscopy ; II-VI semiconductors ; Selenium compounds ; Two photon processes ; Interface states ; Zinc Selenide ; Excitons ; Nanocrystals ; Phonons ; Photoluminescence ; Photons

Semiconducting Materials:712.1 ; Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Classical Physics; Quantum Theory; Relativity:931 ; Atomic and Molecular Physics:931.3 ; High Energy Physics; Nuclear Physics; Plasma Physics:932 ; Crystalline Solids:933.1

Web of Science

1.Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China
2.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
3.Shanghai Dianji Univ, Coll Arts & Sci, Shanghai 201306, Peoples R China

Gao, Yang,Qiu, Xin,Zhao, Fuli,et al. Linear and nonlinear photophysical properties of ZnSe/CdS/ZnS core/shell/shell type II nanocrystals[J]. Photonics Research,2020,8(9):1416-1421.

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

Gao, Yang,et al."Linear and nonlinear photophysical properties of ZnSe/CdS/ZnS core/shell/shell type II nanocrystals".Photonics Research 8.9(2020):1416-1421.