Abstract
Fluorescent characteristics of a series of powder CaF2: Mn phosphors (from 0.01 to 2.47 wt. % of Mn in the mixture) excited by VUV radiation with quantum energies up to 14 eV at 293 K and up to 12 eV at 85 K are measured. Narrow excitation bands of Mn2+ centers found at 7.9 and 8.6 eV (at 293 K) are assigned to partially forbidden transitions of electrons from the ground state 6 S split by the crystalline field (10 Dq=0.71 eV from the literature) in two sublevels to the excited level corresponding to the 6 D term of a free Mn2+ ion (3d 5 → 3d 44s transitions). A wide nonelementary excitation band in the region of 9.1–10.3 eV is interpreted as photogeneration of near-activator D-excitations: allowed transitions of electrons from levels that are split from the top of the valence band under the influence of an impurity ion to the free 4s-orbital of a Mn2+ ion. Channels of energy transport in the CaF2: Mn system are briefly analyzed.
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Translated from Fizika Tverdogo Tela, Vol. 42, No. 2, 2000, pp. 254–262.
Original Russian Text Copyright © 2000 by Denks, Kerikmyaé, Lust, Savikhina.
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Denks, V.P., Kerikmyaé, M.P., Lust, A.L. et al. Photoluminescence of concentration series of CaF2: Mn phosphors excited by VUV radiation. Phys. Solid State 42, 261–269 (2000). https://doi.org/10.1134/1.1131194
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DOI: https://doi.org/10.1134/1.1131194