Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue 6, Pages 3160-3165Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.11.203
Keywords
HfO2; Ce3+; Dy3+; Films; Spray pyrolysis; Photoluminescence; Nonradiative energy transfer; Energy transfer efficiency
Categories
Funding
- CONACyT [78802-2F]
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HfO2 films codoped with Ce3+ and several concentrations of Dy3+ have been processed by the ultrasonic spray pyrolysis technique. Emissions from Dy3+ ions centred at 480 and 575 nm associated with the F-4(9/2) -> H-6(15/2) and F-4(9/2) -> H-6(13/2) transitions, respectively, have been observed upon UV excitation via a non-radiative energy transfer from Ce3+ to Dy3+ ions. Such energy transfer via an electric dipole-quadrupole interaction appears to be the most probable transfer mechanism. The efficiency of this transfer increases up to 86 +/- 3% for the film with the highest Dy3+ content (1.9 +/- 0.1 at.% as measured from EDS). The possibility of achieving the coordinates of ideal white light with increasing the concentration of dysprosium is demonstrated. (C) 2010 Elsevier B.V. All rights reserved.
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