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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geprüft am 20.05.2024