Cs3Sb photocathode was formed by newly developed process and successive in-situ lightingdevices were fabricated in a process chamber. R, G, and B phosphors were applied on the anode plate,respectively. Major parameters such as brightness, power consumption, and efficacy were measured. Thewavelength of LED excitation source was 450 nm. Both high power and low power modes were appliedin the measurement. Measurement values were clearly differentiated by the voltage application modes. The measured values of each parameter was good enough to be applied for general lighting source. Theresults showed that Cs3Sb photocathode formed in atmospheric conditions was functioning as good as thephotocathode formed in UHV conditions, and thus it could be applied to advanced lighting devices.

Photoemission is a process in which photons are converted into free electrons. Photocathodesare the typical materials for the process. They emit electrons when a light is irradiated upon. Thetraditional method of manufacturing photocathodes is complicated, requires specialized equipment, and islimited very small sized samples. Cs3Sb photocathode was formed on a substrate in   atmosphericconditions. The photocathode formation was a gas phase reaction with the substrate. Vacuum deviceswere made to test electron emission characteristics of the formed photocathode. Visible light ofwavelength 475 nm was used for the primary light source. The results showed high current density andlong term stability of the photoelectron emission.