| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5398785 | Journal of Luminescence | 2015 | 27 Pages |
Abstract
The mechanisms of upconversion luminescence of CaF2:Ho crystals and ceramics from 5F3, 5S2(5F4), 5F5 and 5I6 levels upon excitation of 5I7 level of Ho3+ ions were investigated. Different mechanisms are responsible for the populating and depletion of the energy levels of Ho3+ ion in CaF2:Ho crystals and ceramics upon excitation of 5I7 level. The upconversion luminescence from 5F3, 5F5, and 5I6 levels in CaF2:Ho crystals and ceramics is explained by energy transfer upconversion processes. Our results also confirmed that both excited-state absorption and energy transfer upconversion are responsible for the populating of 5S2(5F4) level.
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Authors
A.A. Lyapin, P.A. Ryabochkina, A.N. Chabushkin, S.N. Ushakov, P.P. Fedorov,