



@article {2191,
	title = {(Gd,Yb,Tb)PO                    4 up-conversion nanocrystals for bimodal luminescence-MR imaging
},
	journal = {NanoscaleNanoscale},
	volume = {4},
	year = {2012},
	note = {Export Date: 21 November 2012Source: Scopusdoi: 10.1039/c2nr31226cLanguage of Original Document: EnglishCorrespondence Address: Carlos, L.D.; Department of Physics, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal; email: lcarlos@ua.ptReferences: Auzel, F., (2004) Chem. Rev., 104, p. 139;Sri, S., Frank, C.J.M.V., (2007) J. Disp. Technol., 3, p. 176; 
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},
	month = {2012///},
	pages = {5154 - 5162},
	abstract = {Up-conversion (Gd,Yb,Tb)PO                        4 materials and their potential for bimodal imaging have received little attention in the literature. Herein, we report the first study on the up-conversion emission of (Gd,Yb,Tb)PO 
                        4 nanocrystals synthesized via a hydrothermal method at 150{\textdegree}C. These materials exhibit ultraviolet, blue and green up-conversion emissions upon excitation with a 980 nm continuous wave laser diode. The intensity of the blue-emission band at 479 nm, ascribed to the cooperative up-conversion emission of a pair of excited Yb 
                        3+ ions, depends on the Yb 
                        3+/Tb 
                        3+ concentration ratio, calcination temperature and particle size. Strong green up-conversion emission of Tb 
                        3+ is observed at 543 nm for the 
                        5D 
                        4 {\textrightarrow} 
                        7F 
                        5 transition. Relaxometry measurements reveal that the nanocrystals are efficient T 
                        2-weighted (negative) contrast agents which, combined with visible-light emission generated by infrared excitation, affords them considerable potential for being used in bimodal, photoluminescence-magnetic resonance, imaging. {\textcopyright} 2012 The Royal Society of Chemistry.
},
	keywords = {Blue-emission, Calcination, Calcination temperature, Concentration ratio, Continuous wave lasers, Contrast agent, Gadolinium, Hydrothermal methods, Infrared excitation, Magnetic resonance, Magnetic resonance imaging, Nanocrystals, Relaxometry, Up-conversion, Up-conversion emission, Visible light, Ytterbium},
	isbn = {20403364 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84864473419\&partnerID=40\&md5=c7f84b016cee67b4bf5fc3781f6b9861},
	author = {Debasu, M.L. and Ananias, D. and Pinho, S.L.C. and Geraldes, C.F.G.C. and Carlos, L.D. and Rocha, J.}
}
