Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 247, Issue 9, Pages 2252-2257Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.200945369
Keywords
nanophosphors; rare earth phosphates; time-resolved luminescence spectroscopy
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Funding
- ESF [2009/0202/1DP/1.1.1.2.0/09/APIA/VIAA/141]
- Sadarbibas project [10.0032]
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The energy transfer mechanisms between Ce3+ and Tb3+ in LaPO4:Ce, Tb nanocrystals have been studied by means of time-resolved luminescence spectroscopy in a wide temperature range (10-300 K). Special attention was paid to detailed comparative analysis of both rise and decay emission components of both Ce3+ and Tb3+. Surprisingly, a relatively slow rise (several microseconds) of Tb3+ emission under 266-nm laser excitation was detected, which corresponds to the 4f-5d transition of Ce3+ in LaPO4. It was shown that this rise of Tb3+ emission could not have arisen due to relaxation of Ce3+ ions, whose excited state has a lifetime of about 20 ns. It was demonstrated that the generally accepted concept of a resonant energy transfer from Ce3+ to Tb3+ in LaPO4 could not explain the time- resolved luminescence characteristics as well as the observed temperature dependence. Hence, a new concept of the energy transfer process from Ce3+ to Tb3+ in LaPO4 via host lattice states was suggested and elucidated by proposing several possible models. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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