Thermoluminescence of yttrium oxysulfide activated with europium and other rare earths

Amiryan, A. M.; Gaigerova, L. S.; Gaiduk, M. I.; Zolin, V. F.; Morozov, N. N.; Soshchin, N. P.

doi:10.1007/bf00614573

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“…The luminescence of Eu 3+ in Y 2 O 3 is very effectively optical excited in a charge transfer band [22]. At similar excitation the energy stores in the phosphor at "dissociation" of the excited state of the charge transfer in yttrium oxysulfides, in the result of Eu 2+ ions and "holes" -S − ions form [23]. Based on the obtained results it can be assumed that both at the X-rays irradiation and an optical excitation in the band of the charge transfer of Y 2 O 3 :Eu sample [7,8,22] energy goes to Eu 3+ through (Eu 2+ O − ) complexes (states) of the charge transfer with the following scheme:…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

The Influence of Europium Impurity on the Recombination Luminescence in Y₂O₃

Novosad

Bordun

et al. 2018

Acta Phys. Pol. A

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In this work the researched results of the spectral characteristics of the luminescence and the thermostimulated luminescence curves of Y2O3 and Y2O3:Eu ceramic materials at the X-ray excitation in the 85-295 K range were generalized. Considering the features of Y2O3 crystal structure and the possibility of the formation of the shortlived and stable hole and electron centers of V -and F -type by the ionizing radiation X-ray luminescence spectrum of ceramics at 85 K is fitted into the elementary Gaussian shape bands with the maxima near 3.40, 3.06, 2.67, 2.33, 2.09, and 1.91 eV. The main 3.40 and 3.06 eV bands of the luminescence are caused by the self-trapped excitons of (YO6) 9− complex, when the cation is localized in the field of the trigonal (C3i) and monoclinic (C2) symmetries. The emission at 2.67 eV and the weak bands in the 1.65-2.61 eV region are considered as the radiation of excitons localized on the anion vacancies and the electron centers of F -type (F + , F and F − ). The thermoluminescence of Y2O3 in the 186 and 204 K main peaks range is connected with the thermal destruction of the self-trapped states of O − ions that located in the field of the trigonal and monoclinic symmetries. The activator bands caused by 5 D0 → 7 Fj electronic transitions in Eu 3+ are only observed in the X-ray and thermostimulated luminescence spectra of Y2O3:Eu ceramics. It was assumed that both at the X-rays irradiation and an optical excitation in the band of the charge transfer of Y2O3:Eu sample the energy goes to Eu 3+ through (Eu 2+ O − ) complexes (states) of the charge transfer.

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