Journal
OPTICAL MATERIALS
Volume 58, Issue -, Pages 524-530Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2016.06.044
Keywords
Optical materials; Positron annihilation spectroscopy; Photoluminescence; Defects
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Funding
- DST INSPIRE Fellowship, New Delhi [2011/297]
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GdAlO3:Dy3+ Ba2+ phosphors are synthesized by citrate-based sol-gel method. Photoluminescence and positron annihilation studies are used to investigate the emission and defect chemistry of the phosphors respectively. The strong yellow (Dy3+) emission properties of phosphors are discussed for various concentrations of Dy3+ ions. Upon the addition of Ba2+ ion, an enhancement in emission intensity is observed due to the lattice distortions around Dy3+ ion. The positron studies indicate the presence of defects at crystallite boundaries, vacancy clusters and large voids in the materials. The influence of Ba2+ ion on the photoluminescence and lattice distortion around Dy3+ is also explored. (C) 2016 Elsevier B.V. All rights reserved.
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