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Li G.,Xidian University | Li Z.,Xidian University | Cao Q.,Xidian University | Huang Y.,Xidian University | Shi J.,National Synchrotron Radiation Laboratory
International Journal of Applied Ceramic Technology | Year: 2013

Terbium-activated YAl3(BO3)4 (YAl 3(BO3)4:Tb3+) phosphors were synthesized by both combustion method and solid-state reaction. It was found that the pure-phase YAl3(BO3)4 phosphors synthesized by combustion method were obtained at 1000°C, which was 200°C lower than that by solid-state reaction. The average particle size of the combustion-derived phosphors increased with increasing temperatures. The luminescence characteristics in ultraviolet (UV) - vacuum ultraviolet (VUV) ranges for the YAl3(BO3)4:Tb3+ phosphors were investigated. The bands from 175 nm to 300 nm were attributed to the 4f8-4f75d1 transitions of Tb3+. The other strong bands in the region from 125 nm to 175 nm were assigned to host absorption. The emission spectra showed the strongest emission at 542 nm corresponding to the 5D4→7F5 transition of Tb3+. Moreover, the combustion-derived YAl 3(BO3)4:Tb3+ phosphors generated more intense luminescence than the solid-state-derived phosphors under UV excitation. © 2013 The American Ceramic Society. Source

Chenglin L.,Yancheng Teachers University | Xiaohua W.,Yancheng Teachers University | Xinyi Z.,Fudan University | Guobin Z.,National Synchrotron Radiation Laboratory
2012 5th International Conference on Biomedical Engineering and Informatics, BMEI 2012 | Year: 2012

The vacuum ultraviolet (VUV) spectra of breast sickness tissues, benign or malign breast tumors were studied under the excitation of different VUV photons from a synchrotron radiation light source. The excitation spectra of different samples were monitored at 400 nm and 550 nm. The efficient excitation wavelengths were 133 nm, 193 nm and 252 nm, respectively. The differences of their fluorescence spectra were analyzed, and the results showed that their VUV spectra were different for various breast sickness tissues. There were two peaks in the spectrum when these tissues were excited by 133 nm. When 193 nm light was used to excite the tissues, there appeared a three-peak structure. There was only one distinct peak when these tissues were excited by 252 nm light. The differences of VUV spectra reflect the characteristics of various kinds of breast sickness tissues. The VUV fluorescence technique may be used in the diagnoses of breast tumor, especially available in finding the early cancers. © 2012 IEEE. Source

Wang M.,University of Science and Technology of China | Bao X.,National Synchrotron Radiation Laboratory | Zhu L.,University of Science and Technology of China | Bao Y.,University of Science and Technology of China
Advanced Materials Research | Year: 2012

Accuracy of independent GPS navigation systems is tied to the map-matching algorithm, which overcomes GPS error and traffic map error to map vehicle GPS tracks onto corresponding roads. The paper proposed an improved map-matching algorithm in which an intersection-based dynamic parallelogram criterion is used to improve the accuracy of navigation systems greatly. © (2012) Trans Tech Publications, Switzerland. Source

Jiang Z.-H.,Hefei University of Technology | Wu B.-B.,CAS Institute of High Energy Physics | Li Y.-G.,CAS Institute of High Energy Physics | Liu Z.-K.,National Synchrotron Radiation Laboratory | And 2 more authors.
Guangxue Jishu/Optical Technique | Year: 2010

The Enhanced Specular Reflector (ESR) based on giant birefringent optics is composed with polymer materials and has multilayer structures. Reflectance measurements are done in the reflection angle range of 10°-80° utilizing lasers of 632.8nm, 532nm, 441.6nm and 413.1nm wavelength. Results show that the reflectance is nearly uniform. The average reflectance is higher than 95% and the average transmission is less than 0.5% at the whole angle range. X-ray diffraction analysis expresses its good crystal structures in a large scale. As the reflection film of BC448 plastic scintillator in POLAR Gamma Ray Polarimeter, compared to that with the covered dark paint, the photo collection efficiency of the detector with the ESR wrap is 10 times higher. Source

Gao P.,CAS Shanghai Institute of Ceramics | Gu M.,Tongji University | Liu X.,CAS Shanghai Institute of Ceramics | Liu B.,Tongji University | And 4 more authors.
Journal of Alloys and Compounds | Year: 2014

The photoluminescence spectra of CuI crystals using synchrotron radiation as an excitation light source were obtained at 60 K. The emission peaks at 405, 415, 420 and 443 nm were observed. The possible origins of these peaks were discussed by the temperature dependence of luminescence spectra for CuI material. Meanwhile, the photoluminescence spectra of CuI powder with different excitation intensity were measured and the ultrafast luminescence component of CuI crystals was warranted to be attributed to the recombination of donor acceptor pair. Furthermore, the excitation process was studied by measuring the photoluminescence excitation spectra of CuI crystals and powder. © 2014 Elsevier B.V. All rights reserved. Source

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