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|Title:||Evidence of the influence of phonon density on Tm³⁺ upconversion luminescence in tellurite and germanate glasses|
|Authors:||Tsang, W. S.|
Yu, W. M.
Hui, H. K.
Optical frequency conversion
|Publisher:||American Institute of Physics|
|Source:||Journal of applied physics, 15 Feb. 2002, v. 91, no. 4, p. 1871-1874.|
|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.|
|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.|
|Appears in Collections:||MRC Journal/Magazine Articles|
AP Journal/Magazine Articles
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