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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