Spectra of ZnO nanoparticles under low photon energy excitation--颗粒学报PARTICUOLOGY

Wang, X., Xie, P., Zhao, F., Wang, H., & Wang, Y. (2009). Spectra of ZnO nanoparticles under low photon energy excitation. Particuology, 7(6), 496–500. https://doi.org/10.1016/j.partic.2009.09.004

Spectra of ZnO nanoparticles under low photon energy excitation

Xiaofang Wang ^a, Pingbo Xie ^a, Fuli Zhao ^b, Hezhou Wang ^b, Yanmin Wang ^a *

a College of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China
b State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China

10.1016/j.partic.2009.09.004

Volume 7, Issue 6, December 2009, Pages 496-500

Received 10 March 2009, Revised 21 June 2009, Accepted 17 September 2009, Available online 21 October 2009.

E-mail: wangym@scut.edu.cn

Highlights

Abstract

Time-integrated photoluminescence (PL) spectra between 1.2 and 2.25 eV of ZnO nanoparticles were observed at ambient temperatures when they were excited by a picosecond (ps) laser pulse at a low photon energy of 2.33 eV/532 nm, to show clear red shift when the excitation intensity increased. Gaussian analysis shows that the red shift is due to increase of the relative magnitudes of the Gaussian combination in the low energy region. Temporal evolution of the dominant emissions exhibited a similar double-exponential decay process, in which the respective two distinct decay durations of 189 ps at the corresponding amplitude of 82% and 2081 ps at 18% were identified. Speculation based on the surface-state emission due to the large surface-to-volume ratio of nanoscale materials is used to explain the phenomena.

Graphical abstract

Keywords

ZnO nanoparticles; Time resolved; Surface emission

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