SPIN-ALLOWED AND SPIN-FORBIDDEN 4FN4FN-15D TRANSITIONS FOR HEAVY LANTHANIDES IN FLUORIDE HOSTS
SPIN-ALLOWED AND SPIN-FORBIDDEN 4FN4FN-15D TRANSITIONS FOR HEAVY LANTHANIDES IN FLUORIDE HOSTS
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DOI：
10.1103/physrevb.60.10820
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发表时间：
1999-10
影响因子：
3.7
通讯作者：
R. Wegh;A. Meijerink
中科院分区：
文献类型：
--
作者：
R. Wegh;A. Meijerink
Luminescence spectra of lanthanides in the vacuum ultraviolet spectral region have revealed interesting features for 4 f n↔ 4 f n− 1 5 d (f− d) transitions. For Tb 3+, Dy 3+, Ho 3+, Er 3+, and Tm 3+ in LiYF 4, weak f− d bands are present in the excitation spectra at lower energy than the usually observed strong f− d bands. The weakness of the bands is explained by the spin-forbidden character of transitions from the 4 f n ground state to these 4 f n− 1 5 d states. For Er 3+ and Tm 3+, upon excitation in the higher energetic 4 f n− 1 5 d states two kinds of f− d emission are observed: fast spin-allowed emission with a decay time in the order of ns, and slow spin-forbidden emission with a decay time in the order of μs. These two types of f− d emission are also found for Er 3+ and Tm 3+ in other fluoride hosts.
