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

被引：11

作者：

Espinoza, Sara ^{[1
,2
]}

Juestel, Thomas ^{[1
]}

Haase, Markus ^{[2
]}

机构：

[1] Muenster Univ Appl Sci, Stegerwaldstr 39, D-48565 Steinfurt, Germany

[2] Univ Osnabrueck, Barbarastr 7, D-49076 Osnabruck, Germany

来源：

NANOSCALE | 2018年 / 10卷 / 47期

关键词：

NANOPARTICLES; PHOTOTHERAPY; RADIATION; PHOSPHORS; LUMINESCENCE; EFFICIENCY; GREEN; CORE; GD3+;

D O I：

10.1039/c8nr06867d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：22533 / 22540

页数：8

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