penetration phosphors

penetration phosphors

[‚pen·ə′trā·shən ‚fäs·fərz]
(electronics)
Phosphors of two different colors that are placed in separate layers on the screen of a cathode-ray tube to form a system for creating color displays in which a high-energy beam penetrates the first layer and excites the second, while a low-energy beam is stopped by the first layer and excites it.