Excited-state dynamics of the Tm3+ ions and Tm3+ → Ho3+ energy transfers in LiYF4
Identifieur interne : 003B90 ( Main/Exploration ); précédent : 003B89; suivant : 003B91Excited-state dynamics of the Tm3+ ions and Tm3+ → Ho3+ energy transfers in LiYF4
Auteurs : A. Brenier ; J. Rubin ; R. Moncorge ; C. PedriniSource :
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Abstract
The excited-state dynamics of the Tm3+ ions in a singly doped crystal of LiYF4 is analysed. The Stokes fluorescence processes are interpreted by taking into account the numerous coincidences between the fluorescences emitted by the Tm3+ ions and by considering two kinds of sites. The anti-Stokes fluorescence dynamics which are more complicated are only briefly described. The Tm3+ → Ho3+ energy transfers are then analysed in codoped systems. Very efficient 3F 4 → 5I7 energy transfers are reported at room temperature whereas the 5I7 → 3F 4 back-transfer is completely quenched at low temperatures (T < 200 K ). When the Tm3+ ions are excited in their 3H 4 level, it is shown that three channels of de-excitation have to be considered : a Tm3+ intra-center de-excitation, a cross-relaxation process between adjacent Tm3+ ions of type 3H 4, 3H6 → 3F4, 3F4 and a direct Tm3+ → Ho3+ energy transfer. The former mechanism is very weak while the other two compete, the latter being largely dominant at high Ho3+ concentrations.
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DOI: 10.1051/jphys:0198900500120146300
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