Anti-stokes luminescence in europium monochalcogenides
1977; Elsevier BV; Volume: 22; Issue: 10 Linguagem: Inglês
10.1016/0038-1098(77)90779-7
ISSN1879-2766
AutoresR. Merlín, Raphael Tsu, G. Güntherodt, G. Abstreiter, M. W. Shafer,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoAbstract Anti-Stokes luminescence or up-conversion has been observed in the europium monochalcogenides. The emission occurs from localized regions in the crystals and may be assigned to transitions within the 4f6 configurations of Eu3+. In addition, we have studied the temperature and magnetic field dependence of the previously reported luminescence within the 4f7 configurations of Eu2+. The data show that its previous interpretation in terms of magnon sidebands is questionable. A mechanism requiring the presence of impurities or defects is proposed for the spin-flip transitions involved in both luminescence processes.
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