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Optical spectroscopy of heavily Ho-doped BaY2F8 crystals |
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| Authors: | Taiju Tsuboi Silviu Polosan Kiyoshi Shimamura Hyo Jin Seo |
| Affiliation: | a Faculty of Engineering, Kyoto Sangyo University, Kyoto 603 8555, Japan b Department of Physics, Pukyong National University, Busan 608 737, Republic of Korea c Optronic Materials Center, National Institute for Materials Science, Tsukuba 305 0044, Japan d Laboratory of Solid State Chemistry, Department of Biotechnology, University of Verona and INSTM, UdR Verona, 37134 Verona, Italy |
| Abstract: | The ultraviolet, visible, and near IR (0.8-2.4 μm) luminescence spectra of BaY2F8 single crystals heavily doped with Ho3+ ions (10 and 30 mol%) have been investigated at room temperature and 12 K, together with the luminescence decay curves (up to 300 μs) of the visible emission. Excitation in the visible region gives rise to very strong emission bands originating from the first 5I7 level and located around 2070 nm. However the 5I7 emission is not observed upon excitation at wavelengths shorter than 300 nm. The inter-ionic processes are found to shorten the decay times of the levels emitting in the visible region with respect to the corresponding radiative lifetimes. |
| Keywords: | BaY2F8 crystal Ho3+ ion Luminescence Heavily doped Excitation Lifetime |
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