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Don't be afraid to ask
what is the wavelength of your source?
The following photocathodes are used in Electron Tubes photomultipliers. The quoted wavelength ranges refer to standard borosilicate windows.
bialkali (K - Cs - Sb), 280-630nm
offers high blue and good green response with low dark current.
rubidium bialkali (Rb - Cs - Sb), 280 - 680nm
offers high blue and enhanced green response but twice the dark current of the bialkali.
multialkali S20 (Na - K - Cs - Sb), 280 - 850nm
sensitivity extends ffrom the uv to the infrared but may require cooling to
reduce dark curent.
high temperature bialkali (Na - K - Sb), 280 - 630nm
recommended for high temperature operation at temperatures above 60 °C.
solar blind (KBr, Csl, RbTe, CsTe), 110 - 360nm
when sensitivity in the uv and vuv only is required.