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Title: | Multi-color emission tunability and energy transfer studies of YAl3(BO3)(4):Eu3+/Tb3+ phosphors |
Author: | Reddy, G. V. Lokeswara Moorthy, L. Rama Chengaiah, T. Jamalaiah, B. C. |
Keywords: | RARE-EARTH IONS LIGHT-EMITTING-DIODES LANTHANIDE AQUO IONS THIN-FILMS SPECTROSCOPIC PROPERTIES LUMINESCENT PROPERTIES TB EU PHOTOLUMINESCENCE NANOPHOSPHORS |
Issue Date: | 2014 |
Publisher: | ELSEVIER SCI LTD |
Abstract: | A series of YAB:Eu3+/Tb3+ co-activated phosphors of composition Y(1-x-y)Al3(BO3)(4)xEu(3+)/yTb(3+) (x=0, 0.3, 0.5, 1, 2% and y=0.5%) were prepared by solid-state reaction method and their photoluminescence properties were characterized. Eu3+/Tb3+ co-doped phosphors have shown their excellent luminescent properties in their respective emission regions. The YAB:2%Eu3+ phosphor under 395 nm excitation exhibited red luminescence with Commission International de I'Eclairagein chromaticity coordinates (x=0.627, y=0.334) which are close to an ideal red and commercial Y2O3:Eu3+ red phosphor chromaticity coordinates. The emission color of Eu3+/Tb3+ co-doped phosphors has been tuned from pale-green to white as a function of Eu3+/Tb3+ concentration. Moreover, the Tb3+ acts as an efficient sensitizer and enhances the luminescence of Eu3+ by transferring absorbed excitation energy. The overlapping F-7(0)-> D-5(3,2,1,0) (Eu3+); F-7(1)->>D-5(1,0)(Eu3+); F-7(2)-> D-5(1)(Eu3+) excitation and D-5(3)-> F-7(5,4,3) (Tb3+); D-5(4)-> F-7(5,4)(Tb3+) emission transitions revealed the transfer of energy from Tb3+ to Eu3+ through exchange interaction mechanism in Eu3+-Tb3+ clusters instead of from these ions randomly distributed in YAB lattice. The YAB:Eu3+/Tb3+ phosphors have potential in the field of display technology. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20348 |
DOI: | 10.1016/j.ceramint.2013.09.092 |
ISSN: | 0272-8842 |
Publisher Version: | 10.1016/j.ceramint.2013.09.092 |
Appears in Collections: | CICECO - Artigos |
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Multi-color emission tunability and energy transfer studies of YAl 3(BO3)4Eu3+Tb3+ phosphors_10.1016j.ceramint.2013.09.092.pdf | 2.12 MB | Adobe PDF |
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