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This paper describes the measuring method of fluorescence for membrane layer of Na2kSb antimony-alkali compound
under glass window and quartz window excited by the laser of wavelengths of 514.5 nm and 785nm. Through comparing
the fluorescence intensity of Na2KSb antimony-alkali compound under glass window and quartz window respectively
when excited by laser of wavelength of 514.5 nm, it is found that the fluorescence intensity of Na2kSb layer excited with
wavelength of 785nm is more suitable for the analysis of membrane layer of Na2ksb antimony-alkali compound under
glass window and quartz window. By excitation with the laser in wavelengths of 514.5 nm and 785nm, peak wavelengths
of fluorescence spectrum of membrane layer of Na2KSb antimony-alkali compound are measured as 898nm and 872nm
and the corresponding transition energy levels are 1.42eV and 1.38eV respectively. Through the analysis of fluorescence
spectrum of membrane layer of Na2KSb antimony-alkali compound, it is proved that photoluminescence is an effective
tool for the research of membrane layer of Na2KSb antimony-alkali compound. Besides, further increasing the control
precision of components of Na2KSb, the synthesis process, and the material structure, will further increase the sensitivity
of Na2KSb multi-alkali photocathode, and consequently further improve the performance of devices.
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