The spectral and luminescence properties of Er3+ activated Gd2O3 compacted powders have been investigated. There are several excitation channels of Er3+ luminescence: interband transitions, the energy transfer from Gd3+ ions and intracenter excitation. The quantum efficiency of the Er3+ ions luminescence under different excitation was calculated.
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Kuznetsova, Y. A., & Zatsepin, A. F. (2015). Photoluminescence of Gd2O3:Er - Based materials for conversion of solar energy. In Journal of Physics: Conference Series (Vol. 643). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/643/1/012057