Phosphor screens are used as readout devices for MCP detectors when imaging of the output signal is required. They convert the cascade of electrons from the MCP detector into photons.

A phosphor screen is typically a glass window coated with a layer of an inorganic luminescent compound, also called "phosphor". The phosphor can be coated with an aluminum layer to further reflect the photons in the proper direction and thus increase the photon emission of the screen.

The various phosphors are designated by the letter P followed by a number, and they vary in their properties, such as emission spectrum, decay time and quantum efficiency. The efficiency of a phosphor depends not only on the type of phosphor, but also on its grain size, layer thickness, aluminum layer and other parameters.

The phosphor screen can include a Chromium contact ring to allow direct electric contact to the screen.

ITO (Indium Tin Oxide) conductive layer can be deposited on the glass window to reduce electrostatic effects on the screen.