Source:http://linkedlifedata.com/resource/pubmed/id/20644777
| Subject | Predicate | Object | Context |
|---|---|---|---|
| pubmed-article:20644777 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C0220781 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C1708361 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C0486616 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C0456389 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C1883254 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C1260957 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C2587213 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C1721058 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C1705938 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C1527178 | lld:lifeskim |
| pubmed-article:20644777 | lifeskim:mentions | umls-concept:C0233929 | lld:lifeskim |
| pubmed-article:20644777 | pubmed:issue | 6 | lld:pubmed |
| pubmed-article:20644777 | pubmed:dateCreated | 2010-7-20 | lld:pubmed |
| pubmed-article:20644777 | pubmed:abstractText | Monodisperse beta-NaYF4:Yb,Tm nanocrystals with controlled size (25-150 nm), shape (sphere, hexagonal prism, and hexagonal plate), and composition (Yb: 20-40%, Tm: 0.2-5%) were synthesized from the thermolysis of metal trifluoroacetates in hot surfactant solutions. The upconversion (UC) of near-infrared light (980 nm) to ultra-violet (360 nm), blue (450 and 475 nm), red (650 and 695 nm) and infrared (800 nm) light in the beta-NaYF4:Yb,Tm nanocrystals has been studied by UC spectroscopy. Both the total intensity of UC emissions and the relative intensities of emissions at different wavelengths have shown a strong dependence on different particle sizes and different Tm3+ and Yb3+ concentrations. As a result, different overall output colors of UC emissions can be achieved by altering sizes and Yb3+/Tm3+ doping concentrations of the beta-NaYF4:Yb,Tm nanocrystals. The intensity-power curves of a series of samples have proved that emissions at 360 and 450 nm can be ascribed to four-photon process (1D2 to 3H6 and 1D2 to 3H4, respectively), while emissions at 475 and 650 nm are three-photon processes (1G4 to 3H6 and 1G4 to 3H4, respectively) and emissions at 695 and 800 nm are two-photon ones (3F2 to 3H6 and 3F4 to 3H6, respectively). A UC saturation effect would occur under a certain excitation intensity of the 980 nm CW diode laser for the as-obtained beta-NaYF4:Yb,Tm nanocrystals, leading to the decrease of the slopes of the I-P curves. The results of our study also revealed that the successive transfer model instead of the cooperative sensitization model can be applied to explain the UC behaviors of the beta-NaYF4:Yb,Tm nanocrystals. Further, an unexpected stronger emissions of four-photon process at 360 and 450 nm for approximately 50 nm beta-NaYF4:Yb,Tm nanocrystals than those for the bigger (approximately 150 nm) nanocrystals was observed and explained in terms of the effects of crystallite size, surface-to-volume ratio and homogeneity of the doping cations. | lld:pubmed |
| pubmed-article:20644777 | pubmed:language | eng | lld:pubmed |
| pubmed-article:20644777 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:20644777 | pubmed:status | PubMed-not-MEDLINE | lld:pubmed |
| pubmed-article:20644777 | pubmed:month | Jun | lld:pubmed |
| pubmed-article:20644777 | pubmed:issn | 2040-3372 | lld:pubmed |
| pubmed-article:20644777 | pubmed:author | pubmed-author:YanChunhuaC | lld:pubmed |
| pubmed-article:20644777 | pubmed:author | pubmed-author:SunLingdongL | lld:pubmed |
| pubmed-article:20644777 | pubmed:author | pubmed-author:ZhangYawenY | lld:pubmed |
| pubmed-article:20644777 | pubmed:author | pubmed-author:YinAnxiangA | lld:pubmed |
| pubmed-article:20644777 | pubmed:issnType | Electronic | lld:pubmed |
| pubmed-article:20644777 | pubmed:volume | 2 | lld:pubmed |
| pubmed-article:20644777 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:20644777 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:20644777 | pubmed:pagination | 953-9 | lld:pubmed |
| pubmed-article:20644777 | pubmed:dateRevised | 2011-6-22 | lld:pubmed |
| pubmed-article:20644777 | pubmed:year | 2010 | lld:pubmed |
| pubmed-article:20644777 | pubmed:articleTitle | Colloidal synthesis and blue based multicolor upconversion emissions of size and composition controlled monodisperse hexagonal NaYF4:Yb,Tm nanocrystals. | lld:pubmed |
| pubmed-article:20644777 | pubmed:affiliation | Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, 100871, China. | lld:pubmed |
| pubmed-article:20644777 | pubmed:publicationType | Journal Article | lld:pubmed |
| pubmed-article:20644777 | pubmed:publicationType | Research Support, Non-U.S. Gov't | lld:pubmed |