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Issue 7, 2020
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UV-Vis-NIR absorption spectra of lanthanide oxides and fluorides

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Abstract

The absorption characteristics of lanthanide-based functional materials are of key importance for many scientists and engineers, e.g. in luminescence studies, bioimaging, optical heating/cooling, Raman spectroscopy, and industrial applications such as new light sources, optical sensors, labeling and tracing techniques, etc. Here we show the absorption spectra of solid, optically active lanthanide fluorides (CeF3, PrF3, NdF3, SmF3, EuF3, GdF3, TbF3, DyF3, HoF3, ErF3, TmF3, and YbF3) and oxides (CeO2, Pr6O11, Nd2O3, Sm2O3, Eu2O3, Gd2O3, Tb4O7, Dy2O3, Ho2O3, Er2O3, Tm2O3, and Yb2O3), measured in the UV-Vis-NIR range, from 200 to 2500 nm. The spectra were measured in diffused-reflectance mode using a spherical integrator. We assigned energy levels (2S+1LJ) of lanthanide ions(III), i.e. intraconfigurational 4f–4f transitions to the observed absorption bands. In order to clearly distinguish the 4f → 4f transitions, we also pointed out other absorption bands commonly observed in the measured spectra, such as intrinsic absorption of the matrices, interconfigurational 4f → 5d and charge transfer transitions, artificial bands from absorbed water (present in most materials) and a quartz holder.

Graphical abstract: UV-Vis-NIR absorption spectra of lanthanide oxides and fluorides

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Article information


Submitted
30 Dec 2019
Accepted
22 Jan 2020
First published
22 Jan 2020

Dalton Trans., 2020,49, 2129-2137
Article type
Paper

UV-Vis-NIR absorption spectra of lanthanide oxides and fluorides

M. Runowski, N. Stopikowska and S. Lis, Dalton Trans., 2020, 49, 2129
DOI: 10.1039/C9DT04921E

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