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Excitation capture efficiency of 5D0 europium emission level in Gd0.94-xEuxNbyTa1-yO4
Russian version
Gusev G. A. 1, Masloboeva S. M. 2, Zamoryanskaya M. V. 1
1Ioffe Institute, St. Petersburg, Russia
2Tananaev Institute of Chemistry - Subdivision of the Federal Research Centre “Kola Science Centre of the Russian Academy of Sciences”, Apatity, Russia
Email: ggusev@mail.ioffe.ru
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The article is devoted to the study of the excitation capture efficiency of Eu3+ emission levels in Gd1-xEuxNbyTa1-yO4 (x=0.01-0.4, y=0-1) solid solutions. On the basis of the luminescence spectra analysis, it was shown that the main phase modification of the studied materials was monoclinic (M-polytype, I2/a). The quantitative describe of the excitation capture efficiency for these materials has been obtained for the first time. It was found that for all solid solutions containing Nb the excitation capture efficiency of 5D0 Eu3+ level was the same within the measurement error (about ~2500 μm2ms-1nA-1). In gadolinium tantalates the capture efficiency was about 15% higher. This phenomenon was associated with different excitation channels of 5D0 Eu3+ level in gadolinium tantalum niobates with various Nb/Ta ratio. Keywords: Gadolinium tantalum niobates, Eu3+, Cathodoluminescence, Excitation capture efficiency, Ceramic.
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