Ghosh, A and Nayak, A and Kundu, Paritosh and Debnath, Radhaballabh (2008) Excitation migration from the host to activator: strong green emission of Er+3 in a lead lanthanum tellurite glass. PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B, 49 (1). pp. 8-10. ISSN 1753-3562

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Abstract

Absorption, emission, excitation spectra and the excited state decay kinetics of S-4(3/2), luminescent state of Er3+ ions in a (lead, lanthanum) tellurite glass have been studied. In spite of the fact that the host glass itself has a strong absorption edge in the 375-390 nm wavelength region, the incorporated Er3+ ions exhibit a strong green luminescence upon illuminating the former with light of 375-390 nm. Analysis of the luminescence spectrum shows that the green bands in the wavelength range 534-553 nm and the very weak red component in the range 650-710 nm are, respectively, due to (H-2(11/2) -> I-4(15/2) and S-4(3/2) -> I-4(15/2)) and F-4(9/2) -> I-4(15/2) transition of Er3+. A study of the excited state dynamics of the green luminescence reveals that the process of depopulation of the excited S-4(3/2) state of Er3+ in the glass, involves at least three channels. It is argued that on illuminating the glass at its UV absorption edge, the excitation of Er3+ occurs at some higher energy level via energy transfer from the host, and reaches S-4(3/2) state very efficiently.

Item Type:	Article
Additional Information:	8th International Otto Schott Colloquium, Jena, GERMANY, JUL 23-27, 2006
Subjects:	Glass
Divisions:	UNSPECIFIED
Depositing User:	Bula Ghosh
Date Deposited:	17 Jan 2012 10:42
Last Modified:	05 Mar 2012 10:11
URI:	http://cgcri.csircentral.net/id/eprint/320

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