Kuo Shen,Ruiting Zhang,Yahong Jin,Yanmei Li,Yihua Hu
X-ray storage phosphors are found wide-ranging applications in medical diagnosis, nondestructive testing and X-ray imaging. However, designing X-ray storage phosphors with high electron storage capacity still poses a daunting challenge. In this study, we designed a fluorescent powder based on Eu 2+ -doped BaSiO 3 , demonstrating excellent optical information storage characteristic. Under high-energy X-ray filling, shallow traps exhibit low electron capacity and only produce weak afterglow, which greatly helps to minimize the impact of afterglow on the image quality during X-ray imaging. In addition, the deep traps at 1.01 eV filled with high-energy X-ray allow the material to store information for a long time. The crystal structure, photoluminescence (PL) and thermoluminescence (TL) spectra were studied systematically. The electron trapping properties of the material were analyzed using TL spectroscopy. Finally, we fabricated a flexible film with phosphors, the flexible film has been utilized to demonstrate high-quality real-time X-ray imaging and achieve time-delayed X-ray imaging of curved objects, such as flexible circuit boards.
Jiao Xu,Yang Zhao,Jingjing Chen,Zhiyong Mao,Yanfang Yang,Dajian Wang
Two synthesis routes, solid-state reaction and precipitation reaction, were employed to prepare BaSiO 3 :Eu 2+ phosphors in this study. Discrepancies in the luminescence green emission at 505 nm for the solid-state reaction method sample and in the yellow emission at 570 nm for the sample prepared by the precipitation reaction method, were observed respectively. A detail investigation about the discrepant luminescence of BaSiO 3 :Eu 2+ phosphors was performed by evaluation of X-ray diffraction (XRD), photoluminescence (PL)/photoluminescence excitation (PLE), decay time and thermal quenching properties. The results showed that the yellow emission was generated from the BaSiO 3 :Eu 2+ phosphor, while the green emission was ascribed to a small amount of Ba 2 SiO 4 :Eu 2+ compound that was present in the solid-state reaction sample. This work clarifies the luminescence properties of Eu 2+ ions in BaSiO 3 and Ba 2 SiO 4 hosts.
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