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Journal of Physical Studies 5(1), 85–90 (2001)
DOI: https://doi.org/10.30970/jps.05.85 LUMINESCENCE OF THE Eu3+ IMPURITY IONS IN CALCIUM-GALLIUM-GERMANIUM AND CALCIUM-GALLOGERMANATE CRYSTALSA. E. Nosenko, L. V. Kostyk, R. Ye. Leshchuk
Ivan Franko National University of Lviv,
Chair of Physics of Semiconductors, |
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Optical-luminescence properties of Eu$^{3+}$ impurity ions in calcium gallium germanium garnet (Ca$_3$Ga$_2$Ge$_3$O$_{12}$) and trigonal Ca-gallogermanate (Ca$_3$Ga$_2$Ge$_4$O$_{14}$) crystals in the temperature range of 80-300 K have been investigated. It was shown that in the concentration range of $0.1-3$ at. \% three types of Eu$^{3+}$ activator centers are formed in Ca$_3$Ga$_2$Ge$_3$O$_{12}$ crystals. One type of the Eu$^{3+}$ activator quasicenter is formed in this concentration range in the Ca$_3$Ga$_2$Ge$_4$O$_{14}$:Eu$^{3+}$ crystals. The nature of this quasicenter is caused by the disordering of $1a$ octahedral and $3f$ tetrahedral positions.
PACS number(s): 78.55.Hx, 71.55.-і, 78.40.-q