Abstract
Abstract VUV emission of several stoichiometric fluoride crystals containing Er 3+ and Tm 3+ ions (LiErF 4 , LiTmF 4 , KErF 4 , KTmF 4 , BaTm 2 F 8 ) has been studied with the technique of time-resolved spectroscopy under the pulsed synchrotron radiation excitation. Both fast (nanosecond) and slow (microsecond) VUV emission was detected for Tm 3+ -containing compounds in the studied spectral range (150–200 nm) while for Er 3+ -containing crystals only fast emission is observed. The difference is due to different energy level schemes for high-lying 4f states of these ions. In case of Er 3+ the energy position of some high-lying 4f states is very close to that of emitting 5d levels and so the concentration quenching leads to considerable shortening of the emission.
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