Abstract
Although luminescence properties of Pb2+ and Ce3+ in SrHfO3 host (SHO) have been recently studied due to various potential applications [1, 2], the mechanism of the Pb2+ and Ce3+ excited states thermal quenching has not been addressed. Both Pb2+ and Ce3+ doped SHO microcrystalline powders were prepared by multi-step solid state annealing technique. Radioluminescence and photoluminescence (PL) spectra as well as both the prompt and delayed decay kinetics were investigated in the wide temperature range (10 – 500 K) using the time-resolved luminescence spectrocopy techniques. Temperature dependences (TDs) of PL decay time and PL emission intensity of both Pb2+ and Ce3+ centres were fit by the fenomenological model. Corresponding excited state characteristics were determined. The innovative method of measuring the TD of intensity of the delayed radiative recombination was employed to better understand the origin of temperature quenching of the Pb2+ and Ce3+ decay times [3, 4]. The method put in evidence the excited state thermal ionization of both activators in the SHO host. The influence of dopant concentration and suitability of both the Pb and Ce-doped SHO for phosphor and scintillator applications are discussed.
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