期刊
NANOSCALE
卷 4, 期 16, 页码 5154-5162出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr31226c
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资金
- Fundacao para a Ciencia e a Tecnologia (FCT) [PEst-C/CTM/LA0011/2011, SFRH/BD/67108/2009, REDE/1509/RME/2005]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/67108/2009] Funding Source: FCT
Up-conversion (Gd,Yb,Tb)PO4 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)PO4 nanocrystals synthesized via a hydrothermal method at 150 degrees 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 Yb3+ ions, depends on the Yb3+/Tb3+ concentration ratio, calcination temperature and particle size. Strong green up-conversion emission of Tb3+ is observed at 543 nm for the D-5(4) -> F-7(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.
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