This article is cited in 6 papers

Impurity centers

Ultraviolet luminescence of Li$_6$Gd(BO$_3$)$_3$ : Ce crystals under selective excitation in the region of 4$d$ $\to$ 4$f$ transitions

I. N. Ogorodnikov^a, I. N. Sedunova^a, V. Yu. Ivanov^a, L. I. Isaenko<sup>b

a</sup> Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
^b Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: The subnanosecond time-resolved ultraviolet luminescence of Li$_6$Gd(BO$_3$)$_3$ : Ce crystals under selective excitation by ultrasoft X-rays in the region of the 4$d$ $\to$ 4$f$ core transitions at temperatures of 7 and 293 K has been investigated for the first time. The performed investigation has revealed the following features: an intense fast component of the luminescence decay kinetics in the subnanosecond range due to the high local density of electronic excitations and the processes of Auger relaxation of the core hole; the modulation of the luminescence excitation spectrum by the “giant resonance” absorption band of the 4$d$–4$f$ photoionization in the energy range 135–160 eV; and a new broad luminescence band at an energy of 4.44 eV due to the direct radiative recombination between the genetically related electron in the states of the conduction band bottom and hole in the 4$f$ ground state of the Ce$^{3+}$ ion.

Received: 06.03.2012

 English version: Physics of the Solid State, 2012, 54:10, 2039–2050

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