skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Upconversion luminescence, intensity saturation effect, and thermal effect in Gd{sub 2}O{sub 3}:Er{sup 3},Yb{sup 3+} nanowires

Abstract

In this paper, the upconversion luminescent properties of Gd{sub 2}O{sub 3}:Er{sup 3+},Yb{sup 3+} nanowires as a function of Yb concentration and excitation power were studied under 978-nm excitation. The results indicated that the relative intensity of the red emission ({sup 4}F{sub 9/2}-{sup 4}I{sub 15/2}) increased with increasing the Yb{sup 3+} concentration, while that of the green emission ({sup 4}S{sub 3/2}/{sup 2}H{sub 11/2}-{sup 4}I{sub 15/2}) decreased. As a function of excitation power in ln-ln plot, the green emission of {sup 4}S{sub 3/2}-{sup 4}I{sub 15/2} yielded a slope of {approx}2, while the red emission of {sup 4}F{sub 9/2}-{sup 4}I{sub 15/2} yielded a slope of {approx}1. Moreover, the slope decreased with increasing the Yb{sup 3+} concentration. This was well explained by the expanded theory of competition between linear decay and upconversion processes for the depletion of the intermediate excited states. As the excitation power density was high enough, the emission intensity of upconversion decreased due to thermal quenching. The thermal effect caused by the exposure of the 978-nm laser was studied according to the intensity ratio of {sup 2}H{sub 11/2}-{sup 4}I{sub 15/2} to {sup 4}S{sub 3/2}-{sup 4}I{sub 15/2}. The practical sample temperature at the exposed spot as a function of excitation power andmore » Yb{sup 3+} concentration was deduced. The result indicated that at the irradiated spot (0.5x0.5 mm{sup 2}) the practical temperature considerably increased.« less

Authors:
; ; ; ; ; ; ;  [1]
  1. Key Laboratory of Excited State Physics, Changchun Institute of Optics, Fine mechanics and Physics, Chinese Academic of Sciences, Changchun 130033 (China)
Publication Date:
OSTI Identifier:
20723196
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 123; Journal Issue: 17; Other Information: DOI: 10.1063/1.2087487; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ERBIUM IONS; EXCITATION; EXCITED STATES; GADOLINIUM OXIDES; IRRADIATION; LUMINESCENCE; POWER DENSITY; QUANTUM WIRES; QUENCHING; WIRES; YTTERBIUM IONS

Citation Formats

Lei Yanqiang, Song Hongwei, Yang Linmei, Yu Lixin, Liu Zhongxin, Pan Guohui, Bai Xue, and Fan Libo. Upconversion luminescence, intensity saturation effect, and thermal effect in Gd{sub 2}O{sub 3}:Er{sup 3},Yb{sup 3+} nanowires. United States: N. p., 2005. Web. doi:10.1063/1.2087487.
Lei Yanqiang, Song Hongwei, Yang Linmei, Yu Lixin, Liu Zhongxin, Pan Guohui, Bai Xue, & Fan Libo. Upconversion luminescence, intensity saturation effect, and thermal effect in Gd{sub 2}O{sub 3}:Er{sup 3},Yb{sup 3+} nanowires. United States. doi:10.1063/1.2087487.
Lei Yanqiang, Song Hongwei, Yang Linmei, Yu Lixin, Liu Zhongxin, Pan Guohui, Bai Xue, and Fan Libo. Tue . "Upconversion luminescence, intensity saturation effect, and thermal effect in Gd{sub 2}O{sub 3}:Er{sup 3},Yb{sup 3+} nanowires". United States. doi:10.1063/1.2087487.
@article{osti_20723196,
title = {Upconversion luminescence, intensity saturation effect, and thermal effect in Gd{sub 2}O{sub 3}:Er{sup 3},Yb{sup 3+} nanowires},
author = {Lei Yanqiang and Song Hongwei and Yang Linmei and Yu Lixin and Liu Zhongxin and Pan Guohui and Bai Xue and Fan Libo},
abstractNote = {In this paper, the upconversion luminescent properties of Gd{sub 2}O{sub 3}:Er{sup 3+},Yb{sup 3+} nanowires as a function of Yb concentration and excitation power were studied under 978-nm excitation. The results indicated that the relative intensity of the red emission ({sup 4}F{sub 9/2}-{sup 4}I{sub 15/2}) increased with increasing the Yb{sup 3+} concentration, while that of the green emission ({sup 4}S{sub 3/2}/{sup 2}H{sub 11/2}-{sup 4}I{sub 15/2}) decreased. As a function of excitation power in ln-ln plot, the green emission of {sup 4}S{sub 3/2}-{sup 4}I{sub 15/2} yielded a slope of {approx}2, while the red emission of {sup 4}F{sub 9/2}-{sup 4}I{sub 15/2} yielded a slope of {approx}1. Moreover, the slope decreased with increasing the Yb{sup 3+} concentration. This was well explained by the expanded theory of competition between linear decay and upconversion processes for the depletion of the intermediate excited states. As the excitation power density was high enough, the emission intensity of upconversion decreased due to thermal quenching. The thermal effect caused by the exposure of the 978-nm laser was studied according to the intensity ratio of {sup 2}H{sub 11/2}-{sup 4}I{sub 15/2} to {sup 4}S{sub 3/2}-{sup 4}I{sub 15/2}. The practical sample temperature at the exposed spot as a function of excitation power and Yb{sup 3+} concentration was deduced. The result indicated that at the irradiated spot (0.5x0.5 mm{sup 2}) the practical temperature considerably increased.},
doi = {10.1063/1.2087487},
journal = {Journal of Chemical Physics},
number = 17,
volume = 123,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}