Sharma, Ritu and Rao, A. S. and Deopa, Nisha and Venkateswarlu, M. and Jayasimhadri, M. and Haranath, D. and Prakash, G. Vijaya (2018) Spectroscopic study of Pr3+ ions doped Zinc Lead Tungsten Tellurite glasses for visible photonic device applications. Optical Materials, 78. pp. 457-464. ISSN 0925-3467

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Zinc Lead Tungsten Tellurite (ZnPbWTe) glasses doped with different Pr3+ ion concentrations having the composition 5ZnO + 15PbO + 20WO(3) (60-x)TeO2 + xPr(6)O(11) (where x = 0.5, 1, 1.5, 2.0 and 2.5 mol%) were prepared by using sudden quenching technique and characterized to understand their visible emission characteristic features using spectroscopic techniques such as absorption, excitation and emission. The Judd-ofelt (J-O) theory has been applied to the absorption spectral features with an aim to evaluate various radiative properties for the prominent fluorescent levels of Pr(3+)ions in the as-prepared glasses. The emission spectra recorded for the as-prepared glasses under 468 nm excitation show three prominent emission transitions P-3(0) -> H-3(6), P-3(0) -> F-3(2) and P-3(1) -> F-3(4), of which P-3(0) -> F-3(2) observed in visible red region (648 nm), is relatively more intense. The intensity of P-3(0) -> F-3(2) emission transition in the titled glasses increases up to 1mol% of Pr3+ ions and beyond concentration quenching is observed. Branching ratios (beta(R)) and emission cross-sections (sigma(se)) were estimated for P-3(0) -> F-3(2) transition to understand the luminescence efficiency in visible red region (648 nm). The CIE chromaticity coordinates were also evaluated in order to understand the suitability of these glasses for visible red luminescence devices. From the emission cross-sections, quantum efficiency and CIE coordinates, it was concluded that 1 mol% of Pr3+ ions in ZnPbWTe glasses are quite suitable for preparing visible reddish orange luminescent devices.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Materials Science
Depositing User: Mr. Yogesh Joshi
Date Deposited: 23 Aug 2019 07:54
Last Modified: 23 Aug 2019 07:54

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