Definitions for "Photocathode"
a cathode that emits electrons when illuminated
One of the major components of an image intensifier. Coatings on the photocathode convert a portion of the incident light photons into electrons. Good QE is critical, as photons that are not captured by the photocathode are lost from the final signal produced by the intensifier.
A cathode which emits electrons when exposed to light.