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Journal of Materials Science
Published in: Journal of Materials Science 2/2018

25-09-2017 | Energy materials

Effect of annealing temperature on the luminescence of Ce1−x PO4: Tb x 3+ nanocrystals: A novel theoretical model and experimental verification

Authors: S. Sisira, Dinu Alexander, Kukku Thomas, P. R. Biju, N. V. Unnikrishnan, Cyriac Joseph

Published in: Journal of Materials Science | Issue 2/2018

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Abstract

Terbium-doped cerium phosphate nanocrystals are successfully synthesized through microwave-assisted sol–gel method and are annealed at different temperatures for detailed investigation on structural and optical properties. The structural characterization carried out using X-ray diffraction analysis confirmed that all the samples are crystallized in monoclinic structure having chemical formula CePO4 and revealed the thermal stability of the synthesized samples. A novel theoretical model is proposed to investigate the influence of annealing temperature on Tb3+ by analyzing I4/I3—annealing temperature plot in which two regions are distinguished as above and below the crystallization temperature. A generalized equation derived in terms of rate constants for I4/I3 helps to frame four distinct cases describing the role of different radiative and nonradiative relaxations in the Tb3+ luminescence from 5D3 and 5D4 levels. The subsequent evaluation of each case described the role of defects, cross-relaxation and multiphonon relaxation in the variation of I4/I3 with annealing temperature and verified by the experimentally observed data with the help of TEM, FESEM, TGA and decay analysis.
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Metadata
Title
Effect of annealing temperature on the luminescence of Ce1−x PO4: Tb x 3+ nanocrystals: A novel theoretical model and experimental verification
Authors
S. Sisira
Dinu Alexander
Kukku Thomas
P. R. Biju
N. V. Unnikrishnan
Cyriac Joseph
Publication date
25-09-2017
Publisher
Springer US
Published in
Journal of Materials Science / Issue 2/2018
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-1600-x

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