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Non-vibrational features in NIR FT-Raman spectra of lanthanide sesquioxides

In this paper we report the FT-Raman and FT-NIR spectra of all lanthanide sesquioxides and yttrium sesquioxide. The majority of lanthanide sesquioxides and yttrium sesquioxide shows additional bands in FT-Raman spectra (after the excitation with the 1064 nm line of a Nd:YAG laser) that cannot be explained by vibrational origin. Additional bands in the FT-Raman spectra of heavy lanthanide sesquioxides appear in the Stokes region of the spectrum, but there are also some very strong unexpected bands in the anti-Stokes region of some light lanthanide sesquioxides and in yttrium sesquioxide, notably around 800 and 1100 cm-1. The non-vibrational bands present in FT-Raman spectra of lanthanide sesquioxides and yttrium sesquioxide are not seen in published Raman spectra with an excitation in visible. A possible origin of these additional bands is in luminescence of lanthanide ions.

lanthanide sesquioxides; yttrium sesquioxide; FT-Raman spectroscopy; luminescence

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