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Optical and dielectric studies for Tb3+/Sm3+ co-doped borate glasses for solid-state lighting applications


Albassam, Mohammed Fadil and Lakshminarayana, Gandham and Baki, Sharudin Omar and Bashar, Kh. Bashar and Kityk, Iwan V. and Mahdi, Mohd Adzir (2018) Optical and dielectric studies for Tb3+/Sm3+ co-doped borate glasses for solid-state lighting applications. Optical Materials, 86. 387 - 393. ISSN 0925-3467; ESSN: 1873-1252


Singly doped Tb3+ and Sm3+ ions along with co-doped Tb3+/Sm3+ borate glasses have been fabricated by melt quenching technique. Both TGA and DSC curves were measured for exploration of thermal properties. Among all Tb3+/Sm3+ co-doped glasses, the (Tb0.5-Sm0.5) glass shows the highest emission intensity with respect to others. A total of five emission bands where two are from Tb3+ transitions corresponding to 488 nm (blue) (5D4 → 7F6) and 543 nm (green) (5D4 → 7F5) are found. Three emission bands from Sm3+ at 563 nm (green), 599 nm (orange-red) and 645 nm (red) according to 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, and 4G5/2 → 6H9/2 electronic transitions are identified. The calculated CIE chromaticity (x,y) coordinates for singly doped Tb3+ (Tb0.5) green emission, singly doped Sm3+ (Sm0.5) orange-red emission, and co-doped Tb3+/Sm3+ (Tb0.5-Sm0.5) yellow emission are (0.343, 0.584), (0.607, 0.389), and (0.438, 0.515), respectively, following the CIE 1931 chromaticity diagram. Further, dielectric features were studied for the Tb3+/Sm3+co-doped glass (Tb0.5-Sm0.5) in terms of dielectric constant, dielectric loss and AC conductivity with the increasing of frequency and temperature.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Faculty of Science
DOI Number: https://doi.org/10.1016/j.optmat.2018.10.033
Publisher: Elsevier
Keywords: Borate glass; Thermal analysis; Luminescence property; Dielectric property
Depositing User: Mr. Sazali Mohamad
Date Deposited: 26 Nov 2019 06:14
Last Modified: 26 Nov 2019 06:14
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=/10.1016/j.optmat.2018.10.033
URI: http://psasir.upm.edu.my/id/eprint/75145
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