K_2Te(Cs)日盲紫外光电阴极研究  

Study on K_2Te(Cs)Solar Blind Ultraviolet Cathode

作　　者：李晓峰[1,2] 赵学峰[1] 陈其钧 王志宏[1] 

机构地区：[1]北方夜视技术股份有限公司,昆明650223 [2]微光夜视技术重点实验室,西安710065

出　　处：《光子学报》2014年第6期149-154,共6页Acta Photonica Sinica

基　　金：微光夜视技术重点实验室基金(No.J2011016)资助

摘　　要：研究了K2Te（Cs）日盲紫外阴极的制作工艺并制作了K2Te（Cs）日盲紫外阴极.测量了K2Te（Cs）日盲紫外阴极样品的光谱响应、光谱反射率和250nm波长激发条件下的荧光谱,测量结果表明：与Cs2Te日盲紫外阴极相比,在现有工艺条件下,K2Te（Cs）日盲紫外阴极的灵敏度高于Cs2Te日盲紫外阴极,光谱响应的峰值波长更短,位于250nm,而长波截止波长位于336nm;633nm的光谱灵敏度为10-4 mA/W数量级,较Cs2Te日盲紫外阴极低一个数量级.光谱反射率测量结果表明：K2Te（Cs）日盲紫外阴极的光谱反射率在200~437nm的波长范围内,均高于Cs2Te日盲紫外阴极,而在437~600nm的波长范围内,反射率却与Cs2Te日盲紫外阴极基本相同;折射率及消光系数也低于Cs2Te日盲紫外阴极.荧光谱测试结果表明：在同样条件下,250~350nm波长范围内,由于K2Te（Cs）紫外阴极的荧光强于Cs2Te紫外阴极,因此跃迁电子数量更多,阴极灵敏度更高,比较适用于日盲紫外探测成像器件的制造.The making process of K2Te（Cs） solar blind ultraviolet cathode was described and samples of K2Te（Cs） solar blind ultraviolet cathode were made. The spectral response, spectral reflectance and fluorescence spectra under the excitation condition of 250 nm wavelength about K2Te（Cs） and Cs2Te solar blind ultraviolet cathodes were measured. The measuring results showed that under the existing technological condition, the spectral response of K2 Te（Cs） solar blind ultraviolet cathode is higher, the peak wavelength of spectral response is shorter than that of Cs2Te solar blind ultraviolet cathode. However, their long wavelength thresholds of both cathodes were basically same. The peak wavelength of spectral response of K2Te（Cs） cathode is about 250 nm, long wavelength threshold is about 336 nm. In addition, K2Te（Cs） solar blind ultraviolet cathode has better solar blind property; the spectral sensitivity at 633 nm is ranked at the order of magnitude of 10^-4 mA/W, one order of magnitudes lower than that of CszTe solar blind ultraviolet cathode. As for the spectral reflectance, the measuring results showed that the spectral reflectance of KzTe（Cs） solar blind ultraviolet cathode is higher than that of Cs2Te solar blind ultraviolet cathode within the scope of 200~437 nm wavelength, however is basically same as that of Cs2Te solar blind ultraviolet cathode within the scope of 437~600 nm wavelength, the refractive index and extinction coefficient of K2 Te（Cs） solar blind ultraviolet cathode are less than that of Cs2Te solar blind ultraviolet cathodeThe measuring results on fluorescence spectra indicated that under the same condition and within the scope of 250~350 nm wavelength, the fluorescence of K2Te（Cs） ultraviolet cathode is stronger than that of Cs2 Te ultraviolet cathode, the more strongly the fluorescence, the more transition electrons and the higher spectral response of cathode. The properties of K2Te（Cs）solar blind ultraviolet cathode are better than that of Cs2Te solar blin

关 键 词：K2Te(Cs)阴极 Cs2Te阴极 紫外阴极 反射率 光谱响应 荧光谱 

分 类 号：O462.3[理学—电子物理学]