Ghosh, Arnab and Debnath, Radhaballabh (2009) Enhanced electronic transition probabilities and line intensities of Er(+3) ion in a (W, La)-tellurite glass as revealed from Judd-Ofelt analysis. Solid State Communications, 149 (25-26). pp. 1029-1032. ISSN 0038-1098

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Abstract

A series of tellurite glasses containing dispersed Er(2)WO(6) nanocrystals of different concentration was prepared, and the optical properties of the best luminescent sample (I g mol% of Er(2)O(3)) were investigated by Judd-Ofelt theory. The intensity parameters Omega(2)(= 8.410 x 10(-20) cm(2)), Omega(4)(= 4.833 x 10(-20) cm(2)), Omega(6)(= 2.027 x 10(-20) cm(2)) of the Er(+3) ion in the glass were determined and then used to calculate parameters such as the radiative transition probabilities (A(r)), radiative life-times (tau(f)), fluorescence branching ratios (beta(c)) and the integrated emission cross-section (Sigma sigma) of different transitions. The experimental optical constant and the calculated oscillator strength values (P) suggest that the Er(+3) ions in the glass can most effectively be excited by (4)I(15/2) -> (4)F(7/2) (489 nm) and (4)I(15/2) -> (2)H(11/2) (522 nm), (4)I(15/2) -> (4)F(9/2) (653 nm) and (4)I(15/2) -> (4)I(13/2) (1533 nm) transitions while the spontaneous emission rate (A(r)) values show that strong visible emissions should occur respectively through ((4)I(9/2) -> (4)I(15/2)) and ((4)S(3/2) -> (4)I(15/2) ) transitions and strong NIR emissions through ((4)I(13/2) -> (4)I(15/2)), ((4)S(3/2) -> (4)I(11/2)), ((4)F(9/2) -> (4)I(13/2)), ((4)I(11/2) -> (4)I(15/2)), ((4)S(3/2) -> (4)I(13/2)) transitions. The spectroscopic parameters show that the glass is a superior photonic material compared to other known Er(+3) doped glass and crystals. (C) 2009 Elsevier Ltd. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	(W, La)-tellurite glass:Er(+3); Superior photonic material; Judd-Ofelt analysis; Enhanced oscillator strength
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	27 Feb 2012 08:04
Last Modified:	27 Feb 2012 08:04
URI:	http://cgcri.csircentral.net/id/eprint/1020

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