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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2012, Volume 96, Issue 5, Pages 338–342
(Mi jetpl3219)
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This article is cited in 7 scientific papers (total in 7 papers)
CONDENSED MATTER
Anomalous luminescence of impurity-bound excitons in lithium borate crystals doped with cerium ions
I. N. Ogorodnikov, V. A. Pustovarov Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
Abstract:
The spectra and relaxation kinetics of the anomalous ($\tau<10$ ns) luminescence of Li$_6$GdB$_3$O$_9$:Ce$^{3+}$ crystals have been experimentally detected. The time-resolved vacuum ultraviolet spectroscopy study has shown that optical transitions at $6.2$ eV, caused by the transfer of an electron from the $4f^{1}$ ground state of Ce$^{3+}$ to autoionizing states near the conduction band bottom of a crystal, lead to the formation of an impurity-bound exciton with the hole component localized on the $4f$ state of Ce$^{3+}$ and the electron localized on states of the conduction band bottom. It has been found that the decay of such an exciton in Li$_6$GdB$_3$O$_9$:Ce$^{3+}$ occurs through radiative recombination, leading to fast luminescence at $4.25$ eV. The energy threshold for the formation of the impurity-bound exciton has been determined. The distribution functions of elementary relaxations over the reaction rate constants $H(k)$, which determine the relaxation kinetics and luminescence quenching processes, have been calculated.
Received: 10.07.2012
Citation:
I. N. Ogorodnikov, V. A. Pustovarov, “Anomalous luminescence of impurity-bound excitons in lithium borate crystals doped with cerium ions”, Pis'ma v Zh. Èksper. Teoret. Fiz., 96:5 (2012), 338–342; JETP Letters, 96:5 (2012), 308–312
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https://www.mathnet.ru/eng/jetpl3219 https://www.mathnet.ru/eng/jetpl/v96/i5/p338
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