Gamma-radiation effects on luminescence properties of Eu 3+ activated LaPO 4 phosphor
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Gavrilović, Tamara V.
Putić, Slaviša S.
Article (Published version)
© 2018 Elsevier B.V.
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Eu3+ activated LaPO4 phosphors were prepared by a high-temperature solid-state method and irradiated to different high-doses gamma-radiation in the 0-4 MGy range. No effects of high-doses of high-energy radiation on phosphor's morphology and structure were observed, as documented by electron microscopy and X-ray diffraction measurements. On the other hand, photoluminescence measurements showed that emission properties of phosphor were affected by gamma-radiation; changes in radiative properties being prominent for absorbed radiation doses up to 250 kGy after which no additional changes are observed. Judd-Ofelt analysis of emission spectra is performed to thoroughly investigate radiative properties of phosphors. Analysis showed that radiative transition probability of Eu3+ emission decreases while non-radiative probability increases upon gamma-irradiation. Quantum efficiency of emission is decreased from about 46% to 35% when Eu3+ doped LaPO4 powders are exposed to gamma-radiation of 25...0 kGy dose, showing no additional decrease for higher gamma-radiation doses.
Keywords:En(3+) / Judd-Ofelt / radiation effects / phosphors / LaPO4 / quantum efficiency of emission
Source:Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 2018, 422, 85-90
ISSN: 0168-583X (print); 1872-9584 (electronic)