Issue 47, 2018

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

Abstract

Colloidal solutions of nearly monodisperse 5 nm LaPO4:Gd3+ nanocrystals are shown to strongly emit UV radiation upon excitation with tungsten Kα 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 6P7/28S7/2 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.

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

Article information

Article type
Paper
Submitted
24 Aug 2018
Accepted
06 Nov 2018
First published
07 Nov 2018

Nanoscale, 2018,10, 22533-22540

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

S. Espinoza, T. Juestel and M. Haase, Nanoscale, 2018, 10, 22533 DOI: 10.1039/C8NR06867D

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