photocathode
/ˌfoʊtoʊˈkæθoʊd/
noun
- A negatively charged electrode that releases electrons when light shines on it, used in devices like night-vision goggles and some light sensors.
- Engineers improved the photocathode's efficiency by coating it with a special material.
- The photocathode in the camera tube converts light into an electrical signal.
- Night-vision devices rely on a sensitive photocathode to amplify dim light.