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研究了电子俘获材料Eu ,Sm∶CaS在室温下的荧光激发谱和荧光辐射谱。荧光激发谱由四个激发带构成 ,是由Eu2 + 的 4f7→ 4f55d跃迁和基质吸收所产生的。可见光激发下的荧光辐射谱是由一个极强的宽带和两个极弱的窄带构成 ,紫外光激发下的荧光辐射谱中不仅出现了以上三个辐射带 ,还出现了七个较强的窄带。这些荧光辐射带分别是由Eu2 + 的 4f65d → 4f7、Sm3 + 的 f→ f、Eu3 + 的 f→ f跃迁所产生的。研究还发现 ,当激剂浓度一定时 ,Eu2 + 的辐射带明显比Sm3 + 的辐射带强。
Fluorescence spectrum and fluorescence spectrum of electron capture material Eu, Sm:CaS were studied at room temperature. The fluorescence excitation spectrum is composed of four excitation bands and is generated by the 4f7 → 4f55d transition of Eu2 + and matrix absorption. Under visible light excitation, the fluorescence emission spectrum consists of a very strong broadband and two very narrow narrowbands. In the fluorescence spectrum under UV excitation, not only the above three radiation bands but also seven stronger narrowbands . These fluorescence bands are generated by 4f65d → 4f7 of Eu2 +, f → f of Sm3 + and f → f transitions of Eu3 +, respectively. The study also found that when the concentration of activator, Eu2 + radiation band was significantly stronger than the Sm3 + radiation band.