5d–4f luminescence of Er3+ in YAG:Er3+
5d–4f luminescence of Er3+ in YAG:Er3+
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DOI：
10.1016/j.optmat.2008.11.017
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发表时间：
2009-04
影响因子：
3.9
通讯作者：
E. Aleksanyan;V. V. Harutunyan-V.;R. Kostanyan;E. Feldbach;M. Kirm;P. Liblik;V. Makhov;S. Vielhauer
中科院分区：
文献类型：
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作者：
E. Aleksanyan;V. V. Harutunyan-V.;R. Kostanyan;E. Feldbach;M. Kirm;P. Liblik;V. Makhov;S. Vielhauer
Interconfigurational 4f105d↔4f11transitions 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 4f2D(2)5/2crystal-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−1above the4D1/2level. Such close location allows fast depopulation of the 5d level resulting in the absence of spin-forbidden 5d–4f luminescence and appearance of4D1/24f–4f luminescence.
