authors |
Debasu, ML; Ananias, D; Pinho, SLC; Geraldes, CFGC; Carlos, LD; Rocha, J |
nationality |
International |
journal |
NANOSCALE |
keywords |
COOPERATIVE ENERGY-TRANSFER; PHOSPHORIC-ACID SOLUTION; CONTRAST AGENTS; YB3+ IONS; NANOPARTICLES; TB3+; EMISSION; BLUE; CRYSTALS; GLASS |
abstract |
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. |
publisher |
ROYAL SOC CHEMISTRY |
issn |
2040-3364 |
year published |
2012 |
volume |
4 |
issue |
16 |
beginning page |
5154 |
ending page |
5162 |
digital object identifier (doi) |
10.1039/c2nr31226c |
web of science category |
Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied |
subject category |
Chemistry; Science & Technology - Other Topics; Materials Science; Physics |
unique article identifier |
WOS:000306855500045
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
6.895 |
5 year journal impact factor |
7.315 |
category normalized journal impact factor percentile |
82.576 |
dimensions (citation analysis):
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altmetrics (social interaction):
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