Journal
CURRENT APPLIED PHYSICS
Volume 14, Issue 1, Pages 72-81Publisher
ELSEVIER
DOI: 10.1016/j.cap.2013.07.027
Keywords
Nanophosphor; Size-modulated synthesis; Structure; Raman; Photoluminescence; Eu3+
Funding
- Ministerio de Ciencia e Innovacion of Spain (MICINN) [MAT2010-21270-C04-02/03/04]
- Consolider-Ingenio Program [MALTA CSD2007-0045]
- Generalitat Valenciana [GVA-ACOMP-2013-012]
- EU-FEDER Funds
- MICCIN [BES-2008-003353]
- Universitat Politecnica de Valencia
- Universidad de La Laguna
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Undoped and Eu3+-doped cubic yttria (Y2O3) nanophosphors of good crystallinity, with selective particle sizes ranging between 6 and 37 nm and showing narrow size distributions, have been synthesized by a complex-based precursor solution method. The systematic size tuning has been evidenced by transmission electron microscopy, X-ray diffraction, and Raman scattering measurements. Furthermore, size-modulated properties of Eu3+ ions have been correlated with the local structure of Eu3+ ion in different sized Y2O3:Eu3+ nanophosphors by means of steady-state and time-resolved site-selective laser spectroscopies. Time-resolved site-selective excitation measurements performed in the F-7(0) -> D-5(0) peaks of the Eu3+ ions at C-2 sites have allowed us to conclude that Eu3+ ions close to the nanocrystal surface experience a larger crystal field than those in the nanocrystal core. Under the site-selective excitation in the F-7(0) -> D-5(0) peaks, energy transfer between the sites has also been observed. (C) 2013 Published by Elsevier B.V.
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