Journal
CRYSTENGCOMM
Volume 14, Issue 6, Pages 2302-2307Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ce06311e
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Funding
- National High Technology Research and Development Program of China (863 Program) [2009AA03Z309]
- National Natural Science Foundation of China (NSFC) [51072065, 10874058, 60908031, 60908001, 61077033]
- Program for New Century Excellent Talents in University [NCET-08-0243]
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Tm3+ and Yb3+ ions co-doped alpha-NaYF4 nanocrystals (NCs) were prepared by a one step hydrothermal method with citric acid as the organic additive. The morphology of the as-prepared materials maintains a spherical shape when the surfactant amount, hydrothermal time, and hydrothermal temperature were varied. Under 980 nm excitation, intense ultraviolet (UV) and blue upconversion (UC) emissions were observed from the alpha-NaYF4 NCs and their intensities were much higher than those of the beta-NaYF4 NCs modified by trisodium citrate. The intensities of the 5-photon UC emissions from the I-1(6) level of Tm3+ ions were much stronger than those of the 4-photon UC emissions from the D-1(2) level and the 3-photon UC emissions from the (1)G(4) level. It is for the first time, to our knowledge, that such intense UV UC emissions were obtained with alpha-NaYF4 NCs. The intense UV UC emissions and the relatively long fluorescent lifetimes for the I-1(6), D-1(2), and (1)G(4) levels of Tm3+ ions in alpha-NaYF4 NCs indicate that they could be one of the promising candidates for potential application in short-wavelength solid-state lasers.
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