SONG Wei-ye, SHI Feng, ZHAO Dan, QIN Wei-ping. Synthesis and Characterization of Small Size, Water Soluble, and Intense Ultraviolet Upconversion Emission of β-NaYF<sub>4</sub>∶Yb,Tm Nanocrystals[J]. Chinese Journal of Luminescence, 2012,33(7): 688-692
SONG Wei-ye, SHI Feng, ZHAO Dan, QIN Wei-ping. Synthesis and Characterization of Small Size, Water Soluble, and Intense Ultraviolet Upconversion Emission of β-NaYF<sub>4</sub>∶Yb,Tm Nanocrystals[J]. Chinese Journal of Luminescence, 2012,33(7): 688-692 DOI: 10.3788/fgxb20123307.0693.
0.5%Tm nanocrystals were synthesized via thermal decomposition method following high temperature
and then a change of the nanocrystals was made from oil-soluble to water-soluble by ligand-exchanged method. X-ray diffraction (XRD) analyses showed that the samples were β-NaYF
4
nanocrystals. The TEM images exhibited that the nanocrystals had an average size of 35 nm. Under 980 nm near-infrared laser excitation
the samples showed intense ultraviolet upconversion emission. 5-photon upconversion fluorescence of the Tm
3+
ions in the nanocrystals was stronger than 4-photon and 3-photon upconversion fluorescence. Due to special optical properties and small size
the water-soluble nanocrystals would show potential applications in the biomedical field.
Qin W P, Zhang D S, Zhao D, et al. Near-infrared photocatalysis based on YF3∶Yb3+, Tm3+/TiO2 core/shell nanoparticles [J]. Chem. Commun., 2010, 46(13):2304-2306.
Zhang P, Steelant W, Kumar M, et al. Versatile photosensitizers for photodynamic therapy at infrared excitation [J]. J. Am. Chem. Soc., 2007, 129(15):4526-4527.
Chatterjee D K, Rufaihah A J, Zhang Y. Upconversion fluorescence imaging of cells and small animals using lanthanide doped nanocrystals [J]. Biomaterials, 2008, 29(7):937-943.
Wang L Y, Yan R X, Huo Z Y, et al. Fluorescence resonant energy transfer biosensor based on upconversion-luminescent nanoparticles [J]. Angew. Chem. Int. Ed., 2005, 44(37):6054-6057.
Zhang P, Steelant W, Kumar M, et al. Versatile photosensitizers for photodynamic therapy at infrared excitation [J]. J. Am. Chem. Soc., 2007, 129(15):4526-4527.
Wang F, Liu X G. Upconversion multicolor fine-tuning: visible to near-infrared emission from lanthanide-doped NaYF4 nanoparticles [J]. J. Am. Chem. Soc., 2008, 130(17):5642-5643.
Wang F, Wang J, Liu X G. Direct evidence of a surface quenching effect on size-dependent luminescence of upconversion nanoparticles [J]. Angew. Chem. Int. Ed., 2010, 49(41):7456-7460.
Boyer J C, Cuccia L A, Capobianco J A. Synthesis of colloidal upconverting NaYF4∶Er3+/Yb3+ and Tm3+/Yb3+ monodisperse nanocrystals [J]. Nano Lett., 2007, 7(3):847-852.
Shi F, Wang J S, Qin W P, et al. Facile synthesis of β-NaLuF4∶Yb/Tm hexagonal nanoplates with intense ultraviolet upconversion luminescence [J]. Cryst. Eng. Comm., 2011, 13(11):3782-3787.
Shi F, Wang J S, Qin W P, et al. Greatly enhanced size-tunable ultraviolet upconversion luminescence of monodisperse β-NaYF4∶Yb,Tm nanocrystals [J]. J. Mater. Chem., 2011, 21(35):13413-13421.
Huang M W, Meng F Y, Yuan X H, et al. Research on upconversion spectra of NaY1-x-yF4∶Yb3+em>y,Tm3+x nanoparticles [J]. Chin. J. Lumin. (发光学报), 2008, 29(1):192-194 (in Chinese).
Chen H, Chuai X H, Qin W P, et al. Synthesis and optical properties of water soluble upconversion NaYF4∶Yb,Tm nanoparticles [J]. Chin. J. Lumin. (发光学报), 2010, 31(4):538-542 (in Chinese).