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Title (Primary) Energy migration and Gd3+ ↔ Ce3+ transfer in Ce3+-doped GdP3O9 metaphosphate
Author Demchenko, P.; Gektin, A.; Krasnikov, A.; Pashuk, I.; Shalapska, T.; Stryganyuk, G.; Voloshinovskii, A.; Zazubovich, S.;
Journal Journal of Physics D-Applied Physics
Year 2013
Department ISOBIO;
Volume 46
Issue 23
Language englisch;
POF III (all) T49;
UFZ wide themes RU3;
Abstract

Luminescence-kinetics studies of Ce3+-doped GdP3O9 metaphosphate, which was prepared by a melt-solution technique, are performed using time-resolved luminescence spectroscopy techniques at T = 4.2–300 K. The processes of energy migration along the Gd3+ sub-lattice and energy transfer between Gd3+ and Ce3+ ions are investigated. At low temperatures, the emission of Gd3+ is caused by the radiative decay of its lowest-energy relaxed excited 6P7/2 state, and the Gd3+ → Ce3+ energy transfer is absent. As the temperature increases, the thermally stimulated population of the higher energy 6P5/2, 6P3/2 levels of the Gd3+ 6PJ-excited state takes place, which reveals itself in a higher energy shift of the Gd3+ 6PJ → 8S7/2 emission band. The phonon-assisted population of the Gd3+ 6P5/2 excited level at T < 150 K is suggested to be responsible for the increase in probability of energy migration along the Gd3+ sub-lattice followed by the Gd3+ → Ce3+ energy transfer. The more effective Gd3+ → Ce3+ energy transfer at T > 150 K takes place owing to the thermally stimulated population of the highest-energy 6P3/2 excited level together with the lower energy shift of the Ce3+ 4f–5d1 absorption band. Unlike the Gd3+ → Ce3+ transfer, the reverse Ce3+ → Gd3+ energy transfer is observed at any temperature.


ID 13825
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=13825
Demchenko, P., Gektin, A., Krasnikov, A., Pashuk, I., Shalapska, T., Stryganyuk, G., Voloshinovskii, A., Zazubovich, S. (2013):
Energy migration and Gd3+ ↔ Ce3+ transfer in Ce3+-doped GdP3O9 metaphosphate
J. Phys. D-Appl. Phys. 46 (23), 235103