Colloidal LaPO4:Gd3+ nanocrystals: X-ray induced single line UV emission

Autor(en): Espinoza, Sara
Juestel, Thomas
Haase, Markus 
Stichwörter: Chemistry; Chemistry, Multidisciplinary; CORE; EFFICIENCY; GD3+; GREEN; LUMINESCENCE; Materials Science; Materials Science, Multidisciplinary; NANOPARTICLES; Nanoscience & Nanotechnology; PHOSPHORS; PHOTOTHERAPY; Physics; Physics, Applied; RADIATION; Science & Technology - Other Topics
Erscheinungsdatum: 2018
Herausgeber: ROYAL SOC CHEMISTRY
Journal: NANOSCALE
Volumen: 10
Ausgabe: 47
Startseite: 22533
Seitenende: 22540
Zusammenfassung: 
Colloidal solutions of nearly monodisperse 5 nm LaPO4:Gd3+ nanocrystals are shown to strongly emit UV radiation upon excitation with tungsten K radiation (59.3 keV) or vacuum UV radiation (160 nm). The UV emission of the particles consists mainly of a single line at 311 nm corresponding to the P-6(7/2)-S-8(7/2) transition of Gd3+. The highest emission intensity is observed for LaPO4 nanocrystals with a Gd3+ concentration of 20%. Since the absorption cross section of biomaterials is low for X-rays but high for 311 nm radiation, the UV emission of particles embedded in the biological tissue can only affect the direct vicinity of the particles. Nanocrystals of LaPO4:Gd3+ could, therefore, be interesting for biomedical applications such as strongly localized drug release by X-ray triggered UV uncaging reactions.
ISSN: 20403364
DOI: 10.1039/c8nr06867d

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