Ba^(2+)对卤磷酸盐掺Eu^(2+)荧光粉辐照特性的影响

Ba 2+ INFLUNCENCE TO THE RADIATION PROPERTIES OF Eu 2+ HALOPHOSPHATES

在国家同步辐射实验室的时间分辨光谱站（Ｕ１０Ｂ光束线）研究掺杂Ｅｕ２＋的卤磷酸盐：（Ｃａ，Ｓｒ，Ｂａ）５（ＰＯ４）３ＣｌＥｕ２＋样品和（Ｃａ，Ｓｒ）５（ＰＯ４）３ＣｌＥｕ２＋的真空紫外辐照特性、反射光谱．前者在１８５ｎｍ光的激发下，６０分钟内没有观察到明显的发光强度下降；而后者在１８５ｎｍ光的激发下，１５分钟内就可以观察到其４５０ｎｍ发光的明显变化，从强到弱，直至完全消失．测量了两种样品的反射谱（１００ｎｍ至４００ｎｍ），并根据Ｋ－Ｋ关系计算得出的吸收谱，我们认为：由于Ｂａ２＋的加入，改变了晶格对称性，（Ｏ）－色心的能级发生变化，晶体对１８５ｎｍ附近紫外光的吸收明显降低。

The Eu 2+ halophosphates are studied in the time resolved station(U10B) of the National Synchrotron Radiation Lab. The (Ca, Sr, Ba) 5(PO 4) 3Cl∶ Eu 2+ and (Ca, Sr) 5(PO 4) 3Cl∶Eu 2+ samples are studied on the irradiation properties and the reflection spectra. Excited by the 185nm, the decrease of the emission intensity of (Ca, Sr, Ba) 5(PO 4) 3Cl∶Eu 2+ is not observed in 60 minutes; on the other hand, the emission intensity of (Ca, Sr) 5(PO 4) 3Cl∶Eu 2+ is observed to have a stronger decrease in 15 minutes. According to the reflection spectra of the two samples(from 100nm to 400nm), there is a large difference on 185nm between two samples. At the same time, in the absorption spectra got by the K K relation, the absorption efficiency of two samples are different. We think: when the Ba 2+ is added into the sample, the crystal symmetry is changed, then the (O) energy level changed. The 185nm excitation efficiency of the electron from(O) center decreased. So it can resist the 185nm radiation.