Ghosh, Debarati and Biswas, Kaushik and Balaji, S and Annapurna, K (2018) Realization of warm white light from Ce-Eu-Tb doped zinc fluoroboro silicate glass for lighting applications. Journal of Alloys and Compounds, 747. pp. 242-249. ISSN 0925-8388 (Submitted)

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Abstract

Luminescence characteristics and energy transfer dy namics have been studied in a series of Ce-Eu co-doped and Ce-Eu-Tb triply doped zinc fluoroboro silicate glasses to achieve white light generation for LED applications. In this host, Eu ions are found to exist substantially in divalent state (Eu2+) rather than in trivalent state (Eu3+) which has been verified through XPS studies. Further presence of Ce3+ in co-doped samples aids in the reduction process of Eu3+→Eu2+. In Ce-Eu co-doped glass series, the Ce3+ sensitized luminescence realized from Eu3+ has been ascribed to the electron transfer process between Ce3+ and Eu3+. Inclusion of Tb3+ resulted in enhancement of Eu3+ emission in triply doped glasses due to effective energy transfer from Tb3+ to Eu3+. Chromaticity co-ordinates calculated using CIE diagram resulted in realisation of warm white light (x=0.38, y=0.39; CCT~ 4116 K) from the triply doped glasses under excitation at 378 nm which can prove to be beneficial for lighting living rooms.

Item Type:	Article
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	09 May 2018 05:12
Last Modified:	06 Feb 2020 06:21
URI:	http://cgcri.csircentral.net/id/eprint/3871

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