Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4044
Title: Evidence of the influence of phonon density on Tm³⁺ upconversion luminescence in tellurite and germanate glasses
Authors: Tsang, WS
Yu, WM
Mak, CL 
Tsui, WL
Wong, KH
Hui, HK
Keywords: Tellurium compounds
Germanate glasses
Lead compounds
Tungsten compounds
Glass
Optical frequency conversion
Photoluminescence
Raman spectra
Phonons
Two-photon spectra
Impurity states
Issue Date: 15-Feb-2002
Publisher: American Institute of Physics
Source: Journal of applied physics, 15 Feb. 2002, v. 91, no. 4, p. 1871-1874 How to cite?
Journal: Journal of applied physics 
Abstract: Spectral properties of blue upconversion luminescences in Tm³⁺ doped tellurite (PWT, PbF₂-WO₃-TeO₂) glasses and germanate (PWG, PbF₂-WO₃-GeO₂) glasses pumped by a tunable dye laser were studied at room temperature. Two emission bands centered at 453 and 477 nm, corresponding to the ¹D₂→³H₄and ¹G₄→³H₆ transitions of Tm³⁺ ions respectively, were observed. The two-photon absorption mechanism responsible for the 477 nm luminescence was confirmed by a quadratic dependence of luminescent intensities on the excitation power. Tellurite glasses showed a weaker upconversion luminescence than germanate glasses. This observation was inconsistent with the prediction from the phonon sideband measurement. In this article, Raman spectroscopy and transmittance measurement were employed to investigate the origin of the difference in upconversion luminescences in the two glasses. Compared with phonon sideband spectroscopy, Raman spectroscopy extracts more information, including both phonon energy and phonon density, and therefore, is a more effective analytical tool for understanding upconversion luminescence. Our results showed that the phonon energy as well as phonon density of the host glass is important in determining the upconversion efficiency.
URI: http://hdl.handle.net/10397/4044
ISSN: 0021-8979 (print)
1089-7550 (online)
DOI: 10.1063/1.1429762
Rights: © 2002 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in W. S. Tsang et al., J. Appl. Phys. 91, 1871 (2002) and may be found at http://link.aip.org/link/?jap/91/1871.
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