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Upconversion luminescence of Yb3+-doped and Yb3+ Ho3+-codoped oxyfluoride vitroceramics when excited by a diode laser operating at a wavelength of 960 nm is investigated. A strong 479-nm upconversion cooperative radiation luminescence, attributed to the coupled states of Yb3+Yb3+ clusters, is discovered. This result suggests an interesting and effective path to achieve compact blue upconversion luminescence. The presence of holmium in the Yb3+Ho3+-codoped oxyfluoride vitroceramics substantially reduces intensity of the cooperative upconversion luminescence.
Xiaobo Chen,Meixian X. Li,Z. F. Song,Guowen Wang, andZ. Charles Ying
"Yb3+ ion cooperative upconversion luminescence of oxyfluoride vitroceramics", Proc. SPIE 4645, Rare-Earth-Doped Materials and Devices VI, (5 April 2002); https://doi.org/10.1117/12.461658
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Xiaobo Chen, Meixian X. Li, Z. F. Song, Guowen Wang, Z. Charles Ying, "Yb3+ ion's cooperative upconversion luminescence of oxyfluoride vitroceramics," Proc. SPIE 4645, Rare-Earth-Doped Materials and Devices VI, (5 April 2002); https://doi.org/10.1117/12.461658