| 光谱学与光谱分析 |
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| Photostimulated Luminescence and Color Centers Research in BaClxBr2-x∶Eu2+ Phosphors |
| TIAN Xiao-dong1, DONG Guo-yi1, JIANG Xiao-li2, LIU Qing-bo1, YANG Yan-min1 |
1. College of Physics Science and Technology, Hebei University, Baoding 071002, China
2. Research Institute of China Lucky Film Corporation, Baoding 071054, China |
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Abstract Eu2+ doped BaClxBr2-x phosphors were prepared by solid state method in the present paper. The crystal structure and luminescent properties were studied by XRD, excitation, emission, and photostimulation. The XRD patterns indicate that the samples are single phase of BaClxBr2-x. The X-ray diffraction peak shifts to larger angle as the value of X increases. The emission spectra is a narrow band with a peak locating at 405 nm, which is attributed to the transition of 4f65d→4f7. The excitation spectrum excited by 405 nm is a broad band ranging from 250～380 nm with a peak locating at 303 nm. The photostimulation spectrum is a broad band ranging from 480～800 nm with a peak locating at 575 nm. Through fitting the spectrum curve, the photostimulation spectrum is composed of three bands with peaks locating at about 550, 610 and 685 nm. The three fitting bands correspond to the three color-centers belonging to F(Cl-), F(Cl-Br) and F(Br-)centers, respectively. The photostimulation peaks show a blue shift with increasing the ratio of Cl/Br.
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Received: 2012-02-29
Accepted: 2012-06-20
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Corresponding Authors:
TIAN Xiao-dong
E-mail: hbutxd@126.com
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