Conversion of the valence states of Eu ions in YVO4 with the gamma-ray irradiation |
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Institution: | 1. Department of Physics, Soongsil University, Seoul, 06978, South Korea;2. Department of Physics and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju, 54896, South Korea |
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Abstract: | We investigated the effect of the gamma-ray irradiation on the emission property of the Eu ion doped YVO4. We clearly observed that on exposure to the gamma-ray, sharp emission peaks originating from the Eu3+ ions were suppressed dramatically. Instead, a broad emission feature near 470 nm, which was attributed to the Eu2+ ions, emerged. The quantitative analysis on the emission spectra suggest that the valence state of the Eu ions in our samples was changed from 3 + to 2 + by the gamma-ray irradiation. The conversion of the valence state of the Eu ions was closely related to the formation of the oxygen vacancies induced by the gamma-ray irradiation. |
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Keywords: | Eu ion Emission Gamma-ray irradiation Conversion of the valence states |
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