期刊
NANOMATERIALS
卷 9, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/nano9081127
关键词
persistent phosphors; dosimetry; optically stimulated luminescence; nanophosphor; thermoluminescence
类别
资金
- UGent Special Research Fund (BOF) [BOF16/DOC/327, BOF/PDO/2017/002101]
- BOF GOA Project ENCLOSE at Ghent University
- Natural Sciences and Engineering Research Council (NSERC) under the CREATE program [432290]
- Canadian Institutes of Health Research (CIHR) [FDN-143257, MOP-133500]
- Concordia University
- Natural Science and Engineering Research Council (NSERC) of Canada [RGPIN-2016-06655]
- Fonds Quebecois de la Recherche sur la Nature et les Technologies (FQRNT)
- [RGPIN-2014-06475]
In this work we report on the thermoluminescence (TL) and optically stimulated luminescence (OSL) properties of beta-Na(Gd,Lu)F-4:Tb3+ nanophosphors prepared via a standard high-temperature coprecipitation route. Irradiating this phosphor with X-rays not only produces radioluminescence but also leads to a bright green afterglow that is detectable up to hours after excitation has stopped. The storage capacity of the phosphor was found to be (2.83 +/- 0.05) x 10(16) photons/gram, which is extraordinarily high for nano-sized particles and comparable to the benchmark bulk phosphor SrAl2O4:Eu2+,Dy3+. By combining TL with OSL, we show that the relatively shallow traps, which dominate the TL glow curves and are responsible for the bright afterglow, can also be emptied optically using 808 or 980 nm infrared light while the deeper traps can only be emptied thermally. This OSL at therapeutically relevant radiation doses is of high interest to the medical dosimetry community, and is demonstrated here in uniform, solution-processable nanocrystals.
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