Venkateswarlu, M. and Prasad, M. V. V. K. S. and Swapna, K. and Mahamuda, Sk. and SrinivasaRao, A. and MohanBabu, A. and Haranath, D. (2014) Pr3+ doped lead tungsten tellurite glasses for visible red lasers. Ceramics International, 40 (4). pp. 6261-6269. ISSN 0272-8842

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Abstract

Lead tungsten tellurite (LTT) glasses doped with Pr3+ (0.01, 0.1, 0.5, 1.0 and 1.5 mol%) ions were prepared by the conventional melt quenching technique. The glasses were characterized by X-ray diffraction, optical absorption and photoluminescence spectra. The glassy nature of LTT host glass has been confirmed through XRD measurements. From the measured intensities of various absorption bands of these glasses, the three phenomenological Judd Ofelt (1-0) intensity parameters (Omega 2, Omega 4 and Omega 6) have been evaluated by using the standard as well as modified J-O theory. The J-O parameters measured from the modified J-O theory were used to characterize the absorption and luminescence spectra of these glasses. From this theory, various radiative properties like radiative transition probability (A(R)), total transition probability (A(T)), branching ratio (ss(R)) and radiative lifetime (tau(R)) have been evaluated for the fluorescent levels of Pr3+ in these glasses. The emission spectra show five emission bands in visible region for which the effective band widths (Delta lambda(p)) and emission cross-sections (sigma(se)) have been evaluated. Among all the five emission transitions, a transition P-3(0)-> F-3(2) is more intense and falls in red region. The visible emission spectra, stimulated emission crosssections and branching ratios observed for all these glasses suggest the feasibility of using these glasses as lasers in red region. The CIE chromaticity co-ordinates were also evaluated from the emission spectra to understand the suitability of these materials for red emission. From the absorption, emission and CIE chromaticity measurements, it was found that 1 mol% of Pr3+ ion concentration is quite suitable for LTT glasses to develop bright red lasers from these glasses.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Elsevier.
Uncontrolled Keywords:	Glasses; Opticalabsorption; JOparameters; Photoluminescence
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	03 Nov 2015 06:07
Last Modified:	03 Nov 2015 06:07
URI:	http://npl.csircentral.net/id/eprint/1472

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