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Growth and ultraviolet optical properties of KGd1–xREx(WO4)2 single crystals

Published online by Cambridge University Press:  31 January 2011

M. C. Pujol ,
R. Solé ,
Jna. Gavaldà ,
J. Massons ,
M. Aguiló ,
F. Díaz ,
V. Nikolov  and
C. Zaldo
M. C. Pujol
Affiliation:
Laboratori de Física Aplicada i Cristal.lografia, Universitat Rovira i Virgili, 43005 Tarragona, Spain
R. Solé
Affiliation:
Laboratori de Física Aplicada i Cristal.lografia, Universitat Rovira i Virgili, 43005 Tarragona, Spain
Jna. Gavaldà
Affiliation:
Laboratori de Física Aplicada i Cristal.lografia, Universitat Rovira i Virgili, 43005 Tarragona, Spain
J. Massons
Affiliation:
Laboratori de Física Aplicada i Cristal.lografia, Universitat Rovira i Virgili, 43005 Tarragona, Spain
M. Aguiló
Affiliation:
Laboratori de Física Aplicada i Cristal.lografia, Universitat Rovira i Virgili, 43005 Tarragona, Spain
F. Díaz
Affiliation:
Laboratori de Física Aplicada i Cristal.lografia, Universitat Rovira i Virgili, 43005 Tarragona, Spain
V. Nikolov
Affiliation:
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1040 Sofia, Bulgaria
C. Zaldo
Affiliation:
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
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Abstract

The suitable conditions for growth of KGd(WO4)2 (KGW) and KGd1–xREx(WO4)2— RE = Nd, Er, Yb, Ho, Tm, Pr—by the top-seeded-solution-growth method, using K2W2O7 as solvent, are discussed. The relation between crystal size, mean growth rate, distribution coefficient of the substituting element, and the presence of macrodefects is analyzed. The optical absorption corresponding to the band-gap transition of KGW has been found to be temperature dependent; the absorption threshold energy changes from 34405 cm−1 at 300 K to 35330 cm−1 at 7 K. Narrow pre-edge absorption bands at about 32000 and 32600 cm−1 have been ascribed to Gd3+ intraconfigurational transitions. The photoluminescence of most RE3+ ions has been observed under ultraviolet (UV) excitation close to the absorption threshold of KGW. This suggests the contribution of charge transfer bands. In Pr-doped samples the presence of a minor concentration of Pr4+ could also contribute in this region. The irradiation with UV light does not introduce any significant coloration of our samples.

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Type
Articles
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Journal of Materials Research , Volume 14 , Issue 9 , September 1999 , pp. 3739 - 3745
Copyright
Copyright © Materials Research Society 1999

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