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Study on the observation of Eu(2+) and Eu(3+) valence states in low silica calcium aluminosilicate glasses

By J. A. SAMPAIO, M. C. FILADELPHO, A. A. ANDRADE, J. H. ROHLING, A. N. MEDINA, A. C. BENTO, L. M. da SILVA, F. C. G. GANDRA, L. A. O. NUNES and M. L. BAESSO

Abstract

The optical, magnetic and structural properties of Eu doped low silica calcium aluminosilicate glasses were investigated. The optical absorption coefficient presented two bands at 39 246 and 29 416 cm(-1), which were assigned respectively to the 4f(7) ((8)S(7/2)) -> 4f(6) (4F(J)) 5d (T(2g)), and 4f(7) ((8)S(7/2)) -> 4f(6) (4F(J)) 5d (E(g)) transitions of Eu(2+). The fluorescence measured at 300 K on a sample doped with 0.5 wt% of Eu(2)O(3) exhibited a broad band centered at 17 350 cm(-1), which is attributed to the 4f(6)5d -> 4f(7) transition of Eu(2+), whereas the additional peaks are due to the (5)D(0) -> (7)F(J) (J = 1, 2, 4) transitions of Eu(3+). From magnetization and XANES data it was possible to evaluate the fractions of Eu(2+) and Eu(3+) for the sample doped with 0.5 and 5.0 wt% of Eu(2)O(3), the values of which were approximately 30 and 70%, respectively

Topics: FLUORESCENCE QUANTUM EFFICIENCY, THERMAL LENS SPECTROMETRY, ALUMINATE GLASSES, ENERGY-TRANSFER, SPECTROSCOPIC PROPERTIES, UP-CONVERSION, EARTH IONS, LUMINESCENCE, ABSORPTION, ER3+, Physics, Condensed Matter
Publisher: IOP PUBLISHING LTD
Year: 2013
OAI identifier: oai:agregador.ibict.br.RI_UNICAMP:oai:unicamp.sibi.usp.br:SBURI/1062
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