Probing luminescence of rare earth ions in natural pink fluorites using Raman microscopes

Article Article scientifique Article Probing luminescence of rare earth ions in natural pink fluorites using Raman microscopes eng 2022-05-24 2022-08 author Hagemann Hans-Rudolf 26435 author Ayoubipour Sareh 647314 author Delgado Perez Maria Teresa 795070 author Schnyder Cédric 558918 author Gnos Edwin 704533 Services communs du département des sciences de la terre (DETCO) 1464-1470 10.1002/jrs.6383 0377-0486 It is well-known that many natural fluorite crystals contain rare earth ions. In this work, a series of pink fluorites is studied to demonstrate that the use of Raman microscopes allows to obtain high resolution emission spectra of trivalent rare earth ions. These emission spectra allow in principle to distinguish differences of the local environment related to the charge compensation necessary when the divalent Ca ion is replaced by a trivalent rare earth ion. The pink fluorites from the Alps have grown under hydrothermal conditions, which results in the incorporation of oxygen into the fluorite. In one sample from Juchlistock (Bern, Switzerland), a trigonal Eu3+-oxygen center is clearly identified. Interestingly, a pink fluorite from China (Huanggang Mine, Inner Mongolia, China) shows a quite different emission spectrum from those of the Alps. In this sample, the emission bands have much lower relative intensity compared with the intensity of the CaF2 Raman peak, indicating a much lower content of Er3+ and Ho3+ which emit around 520–560 nm. Literature examples show that Raman measurements of differently colored fluorite crystals can also present sharp rare earth spectra. By extension, it is thus possible to observe and identify emission spectra of rare earth ions in other mineral crystals using Raman microspectroscopy and avoid misassignments of the corresponding observed Raman spectra. Laser excited luminescence Pink fluorite Rare earth spectra Dewey 540 Swiss National Science Foundation Fundamental studies of boron hydrogen compounds and luminescence studies on energy transfer in rare earth containing phosphors 182494 CH Projects Swiss National Science Foundation Size effects and applications of the persistent phosphors for bioimaging 191108 CH Careers 38 Département de chimie physique 142 false Journal of Raman spectroscopy 53 8 152f52f0-afbb-4560-9d0c-99b7c4f1b711 Article (Published version) Public Hagemann_JRS_2022.pdf 3943402 application/pdf CC BY-NC-4.0 eb64b428a8061f6d60d077af9a443bde9a5b7eead246cfe7a4d29422fc022a04 openAccess Faculté des sciences / Section de chimie et biochimie / Département de chimie physique

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Probing luminescence of rare earth ions in natural pink fluorites using Raman microscopes	Journal of Raman spectroscopy	2022	79	84
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