Red light emission from europium doped zinc sodium bismuth borate glasses

Hegde, Vinod and Dwaraka, V C S and Upadhyaya, V and Mahato, KK and Kamath, Sudha D (2017) Red light emission from europium doped zinc sodium bismuth borate glasses. Physica B: Condensed Matter, 527 (1). pp. 35-43. ISSN 09214526

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Abstract

Zinc sodium bismuth borate (ZNBB) glasses doped with different concentrations of europium were prepared by conventional melt quenching method and characterized through the measurements of density, refractive index, X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectra, optical absorption, luminescence and radiative lifetimes. FTIR spectra showed seven characteristic peaks of bismuth and borate functional groups in the range of 400–1600 cm−1. The optical band gap and bonding parameters have been calculated from absorption spectra. Photoluminescence spectra recorded in the visible region with 394 nm excitation are used to calculate the Judd-Ofelt (JO) intensity parameters (Ω2 and Ω4). The JO intensity parameters have been used to calculate the radiative parameters such as branching ratio (β), stimulated emission cross-section (σse), transition probability (A) for the fluorescent level of 5D0→7F2. Decay rates through single exponential are used to calculate the lifetime (τm) of the meta-stable state 5D0 of (Eu3+ ion) these glasses. The radiative parameters measured for all these glasses show 0.7 mol% europium doped zinc sodium bismuth borate glass 5D0→7F2 transition has the potential for red laser applications. The quality of the colour emitted by the present glasses are estimated quantitatively by CIE chromaticity coordinates, which confirms the suitability of these glasses as a red emitting material for field emission technologies and LEDs.

Item Type: Article
Uncontrolled Keywords: Doped glass, FTIR, optical band gap, photoluminescence, lifetime, CIE chromaticity.
Subjects: Life Sciences > MLSC Manipal
Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 10 Nov 2017 03:59
Last Modified: 10 Nov 2017 03:59
URI: http://eprints.manipal.edu/id/eprint/149946

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