Size Dependent Optical Properties of CdSe Nanocrystals at Low Temperature

Heedae Kim; Sung Hun Kim; Hong Seok Lee

doi:10.5757/ASCT.2023.32.1.16

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Applied Science and Convergence Technology 2023; 32(1): 16-18

Published online January 30, 2023

https://doi.org/10.5757/ASCT.2023.32.1.16

Size Dependent Optical Properties of CdSe Nanocrystals at Low Temperature

Heedae Kim^{a , ∗} , Sung Hun Kim^b , and Hong Seok Lee^b

^aSchool of Semiconductor Science & Technology and Semiconductor Physics Research Center, Jeonbuk National University, Jeonju 54896, Republic of Korea
^bDepartment of Physics, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, Republic of Korea

Correspondence to:hdkim1@jbnu.ac.kr

Received: November 14, 2022; Accepted: December 10, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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Abstract

In this work, we demonstrate that the optical properties of CdSe nanocrystals (NCs) show a strong size dependence at low temperature (~10 K). The photoluminescence (PL) peak is shifted to higher energies as the growth time of synthesized CdSe NCs decreases, which can be attributed to size differences of CdSe NCs. The power-dependent PL measurements, where the PL intensities are linearly increased as a function of laser excitation powers were performed. These linearly increased PL intensities support the excitonic properties of confined states in CdSe NCs. In addition, the carrier dynamics of CdSe NCs are observed using time-resolved PL measurements. The carrier decay times are increased as the sizes of CdSe NCs are increased.

Keywords: CdSe nanocrystals, Size dependent photoluminescence, Time-resolved photoluminescence, Carrier decay times