Magneto-optical studies of valence instability in europium and terbium phosphors

0458873 - FZÚ 2017 RIV NL eng J - Článek v odborném periodiku
Rodrigues, L.C.v. - Hölsä, J. - Brito, H.F. - Maryško, Miroslav - Matos, J.R. - Paturi, P. - Rodrigues, R.V. - Lastusaari, M.
Magneto-optical studies of valence instability in europium and terbium phosphors.
Journal of Luminescence. Roč. 170, Feb (2016), 701-706. ISSN 0022-2313. E-ISSN 1872-7883
Institucionální podpora: RVO:68378271
Klíčová slova: valence * europium * terbium * oxysulfide and -sulfate * phosphors * paramagnetic susceptibility
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.686, rok: 2016

The impurities and dopants'inappropriate valences may deteriorate the performance of luminescent materials, cause waste of the precious rare earth(R)material and thus incur financial losses.The usual methods to detect the valence of rare earths;XPS,Mössbauer and XANES spectroscopies, are not sensitive enough for low concentrations and the EPR methods are not very suitable for powders.In this work,the comparison between the theoretical and experimental temperature-dependent paramagnetic susceptibilities was used to obtain quantitatively the concentrations of the impurity valence in Eu2O2S and Tb2O2SO4, both containing nominally only R3+.
Trvalý link: http://hdl.handle.net/11104/0259094