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It is assumed from the energy level that ultraviolet (UV) photons may have intensifying effect on BaFBr: Eu^2 .In this paper, effect of UV photons (220-290 nm) on the PSL intensity of X-ray irradiated BaFBr:Eu^2 was measured and compared to that on the PSL intensity of 220 nm photons irradiated BaFBr: Eu^2 . 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. 相似文献
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X射线影像存储材料BaFxCl2—x:Eu^2+的制备及其热释发光和光激励发光 总被引:1,自引:0,他引:1
本文采用了不同温度下两次烧结的新方法,制备了系列X射线影像存储材料BaFxCl2-x:Eu^2 (x=0.90,0.95,1.00,1.05,1.10,1.15).cefpntyoF/Cl比值,研究了在X射线辐照后BaFxCl2-x:Eu^2 的热释发光性质,给出了热释发光峰的温度与缺陷种类的关系。最后,我们研究了BaFxCl2-x:Eu^2的光激励发光性质,给出了F/Cl比值与光激励发光强度的关系。 相似文献
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燃烧合成法制备的BaFBr:Eu2+的性质研究 总被引:2,自引:2,他引:0
BaFBr:Eu^2 是一种性能优良的光激励发光材料,它能够存储X光信息,并通过可见光激励发光读出存储的光信息.当前广泛用于医疗和工业设备上。BaFBr:Eu^2 的传统制备方法是高温固相法,文章介绍了应用燃烧合成法,采用尿素一硝酸盐系燃烧合成获得BaFBr:Eu^2 ,分别利用XRD和分光光度计对产物的各种性质进行测量研究。燃烧合成法一直应用在合成金属氧化物和难熔金属之间的合成上,制备BaFBr:Eu^2 这类不含氧的化合物还未见报道。实验结果表明,利用燃烧合成法制备BaFBr:Eu^2 可以大幅度减少制备时间和能源的消耗,而且晶相单一,发光强度可以达到高温固相法的水平。 相似文献
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在BaFBr:Eu^2 中掺人Si^4 合成了一种新的X射线影像板材料,其主要光激励发光(PSL)性能,如射线敏感度和长波可激发性都优于低价阳离子掺杂的BaFBr:Eu^2 。用喇曼和顺磁共振(EPR)等手段表征了掺Si^4 后BaFBr:Eu^2 中电子陷阱的结构,并根据此结构解释了其激发波长的红移量比其它低价阳离子掺杂都高的原因。 相似文献
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Thermal stimulated luminescence (TSL) and photostimulated luminescence (PSL) were used to investigate the luminescent performance of Al^3 -doped BaFBr:Eu^2 in different synthetic conditions. Theory analysis shows that the decay of TSL spectra is different from that of PSL spectra. Theoretical calculation was used to investigate the effects of energy state in Al^3 -doped BaFBr:Eu^2 by different synthetic conditions. The relationship of color center‘s energy and different synthetic conditions is discussed. 相似文献
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不同聚集态色心对BaFBr:Eu2+光激励发光的影响 总被引:1,自引:1,他引:0
BaFBr:Eu^2 作为一种优良的光激励发光材料,广泛应用于生物学、医学、同步辐射等领域。BaFBr:Eu^2 粉末材料涂覆在基片上做成X线影像板(简称IP板),可以代替X线感光胶片记录X线影像。本文系统研究了在BaFBr:Eu^2 中掺杂不同的金属离子,促使BaFBr:Eu^2 的光激励波长峰值红移以及对其发光强度的影响,并在理论上探讨了不同金属离子的掺入所形成色心的类型。 相似文献