Abstract
We investigated the doping-site dependence of photoluminescence and upconversion (UC) emission characteristics of Ho3+ and Yb3+ co-doped BaHfO3 polycrystals. Under 980-nm near-infrared excitation, we detected sizable green (550 nm) and red (660 and 760 nm) UC emissions from Ho3+ ions based on the assistance of Yb3+ ions as sensitizers. These emission features showed strong temperature-dependent variation and became more intense with decreasing temperature. Notably, the UC emission from Ho3+ was stronger in the samples in which the Ho3+/Yb3+ dopants were substituted for Hf4+ ions rather than for Ba2+ ions. The results suggest that the asymmetry ratio of the crystal field surrounding the Ho3+ ions should be an important factor for the UC emission properties.
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Acknowledgments
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2018R1D1A1A02086130).
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Lim, H., Jang, S. & Lee, Y.S. Doping-Site Dependence of Upconversion Emission of Ho3+ Ion in BaHfO3. J. Korean Phys. Soc. 76, 155–161 (2020). https://doi.org/10.3938/jkps.76.155
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DOI: https://doi.org/10.3938/jkps.76.155