Lyapin A.; Ryabochkina P.; Chabushkin A.; Ushakov S.; Fedorov P.
(2015)
© 2015 Elsevier B.V. All rights reserved. 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. ...