Luminescence properties of Sm3+ ions doped heavy metal oxide tellurite-tungstate-antimonate glasses. Issue 18 (15th December 2017)

• Record Type: Journal Article
• Authors: Rao, V. Himamaheswara; Prasad, P. Syam; Babu, M. Mohan; Rao, P. Venkateswara; Santos, Luís F.; Raju, G. Naga; Veeraiah, N.
• Is Part Of: Ceramics international. Volume 43:Issue 18(2017)
• Page Start: 16467
• Page End: 16473
• Publication Date: 2017-12-15
• Subjects: Tellurite glasses -- Sm3+ ions -- Photoluminescence spectra -- Radiative parameters -- Decay profile; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.09.028
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The trivalent Sm 3+ ion doped tellurium-antimony-tungsten oxides based glasses were prepared by conventional melt quenching and pressing method. Spectroscopic characterizations such as optical absorption, photoluminescence and decay profile measurements were performed on the glasses. Judd-Ofelt theory is used to evaluate the oscillator strengths and the three phenomenological intensity parameters (Ωλ, λ = 2, 4, 6) of the glasses. The photoluminescence spectra recorded under 479 nm excitation exhibited the emission bands at 562, 598, 645 and 708 nm corresponding to the transitions 4 G5/2 → 6 HJ ( J = 5/2, 7/2, 9/2, 11/2) respectively. Using J-O parameters (Ωλ ) various important radiative parameters viz., transition probabilities, emission cross-sections, branching ratios of various emission bands were evaluated. Decay profiles were recorded to find the lifetime of the 4 G5/2 excited level and the obtained life time values are observed to decrease with an increase of Sm 3+ ion concentration; such decrease is attributed due to clustering of Sm 3+ ions which may cause luminescence quenching.