Jayasimhadri, M. and Jha, Kaushal and Ratnam, B. V. and Woo, Hyun-Joo and Jang, Kiwan and Rao, A. S. and Haranath, D. (2017) Single NUV band pumped PbO-GeO2-TeO2:Tb3+ yellowish green emitting glass material for tricolor white LEDs. Journal of Alloys and Compounds, 711. pp. 395-399. ISSN 0925-8388

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Abstract

In this work, Tb3+ ions doped lead-germanate-tellurite (LGT) glasses were prepared by conventional melt quenching technique with different dopant concentrations ranging from 0.5 to 3.5 mol %. X-ray diffraction (XRD) and FT-IR analysis were carried out to analyze the structural properties of LGT glass. The excitation spectra revealed a single band centered in the NUV region at 380 nm by monitoring emission at 545 nm. The emission spectra consist of four bands, which are attributed to the D-5(4)-> F-7(1) (J = 3-6) transitions. Among these transitions, the strong emission band was observed at 545 nm corresponding to the D-5(4)-> F-7(5) transition and the optimized doping concentration of Tb3+ ions was 2 mol %. The Huang's theory and I-H model indicate the possibility of energy transfer via electric dipole-dipole interaction between Tb3+ ions. The CIE chromaticity coordinates were (x = 0.282 and y = 0.614) and emits intense yellowish green light. The decay curves measured for D-5(4) level for the samples with different doping concentrations and the lifetime for the optimized sample was 548 mu s. The results indicate that these glasses have potential applications in solid state lighting and display devices.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M\S Elsevier.
Subjects:	Chemistry > Physical Chemistry Materials Science Metallurgy & Metallurgical Engineering
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	21 Feb 2019 06:34
Last Modified:	21 Feb 2019 06:34
URI:	http://npl.csircentral.net/id/eprint/2851

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