Journal
JOURNAL OF APPLIED PHYSICS
Volume 111, Issue 3, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3681293
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- Ministry of Education of China [Z2010067]
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Rod-shaped and plate-shaped NaYE4:Yb3+/Er3+ nanocrystals (NCs) have been synthesized via a facile oleic acid-assisted hydrothermal route. The intensity and color tunability by shape controlling of NCs is demonstrated by up and down frequency conversions in NaYE4:Yb3+/Er3+ NCs. The results obviously show that rod-shaped NCs present much stronger upconversion luminescence intensity and smaller ratio of green to red emission intensity than that of plate-shaped NCs. The underlying reason of luminescence enhancement by shape controlling is explored, and a mechanism of the enhancement based on the decrease of nonradiation relaxation probability and the increase of energy transfer efficiency from Yb3+ to Er3+ is proposed for nanorods. (C) 2012 American Institute of Physics. [doi:10.1063/1.3681293]
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