Journal
JOURNAL OF MATERIALS SCIENCE
Volume 53, Issue 2, Pages 1380-1394Publisher
SPRINGER
DOI: 10.1007/s10853-017-1600-x
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Funding
- University Grants Commission, Govt. of India through SAP-DRS program [F.530/12/DRS/2009 (SAP-1)]
- Department of Science and Technology, Govt. of India through DST-PURSE program [SR/S9/Z-23/2010/22 (C,G)]
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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 I-4/I-3-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 I-4/I-3 helps to frame four distinct cases describing the role of different radiative and nonradiative relaxations in the Tb3+ luminescence from D-5(3) and D-5(4) levels. The subsequent evaluation of each case described the role of defects, cross-relaxation and multiphonon relaxation in the variation of I-4/I-3 with annealing temperature and verified by the experimentally observed data with the help of TEM, FESEM, TGA and decay analysis.
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