Simulating the Intensifying Effect of Phosphors on Imaging Plate with UV photons
来源期刊：JOURNAL OF RARE EARTHS2004年第1期
论文作者：张丽平 熊光楠 郑震 马宇平
Key words：optics; photo-stimulated luminescence; intensifying effect; UV excitation; imaging plate; rare earths;
Abstract: It is assumed from the energy level that ultraviolet(UV) photons may have intensifying effect on BaFBr∶Eu2+. In this paper, effect of UV photons(220～290 nm) on the PSL intensity of X-ray irradiated BaFBr∶Eu2+ was measured and compared to that on the PSL intensity of 220 nm photons irradiated BaFBr∶Eu2+. It was found that after the excitation of UV photons the PSL intensity of X-ray irradiated samples decreases least at 250 nm and that of 220 nm photons irradiated samples increases most at 250 nm. When the irradiation sources are X-rays and 220 nm photons the excited electrons are photoelectron and thermal-electrons, respectively, and they have different possibility of being captured by electron traps or combined with luminescent centers. And the peak at 250 nm can be explained with the model of electrons tunneling. It is assumed that the electrons excited by 250 nm have the most possibility of tunneling.
张丽平1，熊光楠1，郑震1，马宇平1
(1.Institute of Material Physics, Tianjin University of Technology, Tianjin 300191, China)
Abstract:It is assumed from the energy level that ultraviolet(UV) photons may have intensifying effect on BaFBr∶Eu2+. In this paper, effect of UV photons(220～290 nm) on the PSL intensity of X-ray irradiated BaFBr∶Eu2+ was measured and compared to that on the PSL intensity of 220 nm photons irradiated BaFBr∶Eu2+. It was found that after the excitation of UV photons the PSL intensity of X-ray irradiated samples decreases least at 250 nm and that of 220 nm photons irradiated samples increases most at 250 nm. When the irradiation sources are X-rays and 220 nm photons the excited electrons are photoelectron and thermal-electrons, respectively, and they have different possibility of being captured by electron traps or combined with luminescent centers. And the peak at 250 nm can be explained with the model of electrons tunneling. It is assumed that the electrons excited by 250 nm have the most possibility of tunneling.
Key words:optics; photo-stimulated luminescence; intensifying effect; UV excitation; imaging plate; rare earths;
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