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5d–4f luminescence of Er3+ in YAG:Er3+
- Source :
-
Optical Materials . Apr2009, Vol. 31 Issue 6, p1038-1041. 4p. - Publication Year :
- 2009
-
Abstract
- Abstract: Interconfigurational 4f 105d ↔4f 11 transitions of the Er3+ ion in the YAG host were studied under both VUV photon (synchrotron radiation) and electron beam excitation. It was found that the lowest low-spin 5d level of the Er3+ ion has a rather large energy gap to the next lower 4f 2 D(2)5/2 crystal-field level, which results in a relatively low rate of nonradiative transitions from this 5d level leading to the appearance of weak spin-allowed 5d–4f luminescence at low temperature. The lowest high-spin 5d level, from which spin-forbidden 5d–4f radiative transitions could occur potentially, is situated only at ∼500cm−1 above the 4 D 1/2 level. Such close location allows fast depopulation of the 5d level resulting in the absence of spin-forbidden 5d–4f luminescence and appearance of 4 D 1/2 4f–4f luminescence. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09253467
- Volume :
- 31
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Optical Materials
- Publication Type :
- Academic Journal
- Accession number :
- 37158680
- Full Text :
- https://doi.org/10.1016/j.optmat.2008.11.017