Jha, Kaushal and Vishwakarma, Amit K. and Jayasimhadri, M. and Haranath, D. (2017) Multicolor and white light emitting Tb3+/Sm3+ co-doped zinc phosphate barium titanate glasses via energy transfer for optoelectronic device applications. Journal of Alloys and Compounds, 719. pp. 116-124. ISSN 0925-8388

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Abstract

A series of Tb3+/Sm3+ co-doped ZPBT glasses have been successfully prepared via melt quenching technique and their photoluminescence properties and energy transfer mechanism were investigated. Tb3+ doped glass exhibits dominant emission peak at 544 nm corresponding to D-5(4)-> F-7(5) transition under 375 nm excitation whereas Sm3+ doped glass exhibits intense emission peak at 599 nm corresponding to (4)G(5/2) -> H-6(7/2) under 399 nm excitation. The CIE chromaticity coordinates (0.259, 0.590) and (0.570, 0.428) are located in the pure green and orange region for Tb3+ and Sm3+ doped glasses, respectively. The Tb3+/Sm3+ co-doped glasses under 375 nm excitation emit a combination of blue, green and orange-red light while under 484 nm excitation emits green and red-orange emission light. The energy transfer occurs from Tb3+ to Sm3+ via dipole-dipole interaction, which was confirmed by applying Dexter and Reisfeld's theory and Inokuti Hirayama (I-H) model. Moreover, the energy transfer efficiencies and probabilities were calculated from the decay curves. The color tone of these glasses can be modulated from yellowish-green to warm-white via greenish-yellow by appropriate tuning of Sm3+ concentrations and excitation wavelengths. These results indicate that the prepared glasses can be a potential candidate for white light as well as solid state lighting applications.

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:	12 Nov 2018 07:50
Last Modified:	12 Nov 2018 07:50
URI:	http://npl.csircentral.net/id/eprint/2797

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