Fluorescent material for dispaly unit, process for producing the same and color display unit including the same

摘要

Fluorescent material for display unit ( 1 ) comprising fluorescent substance matrix particles ( 2 ) constituted substantially of zinc sulfide of crystal structure composed mainly of, for example, hexagonal crystal or cubic crystal. First activator ( 3 ) is localized in surface layer part ( 2 a) of the fluorescent substance matrix particles ( 2 ). Second activator is uniformly dispersed in the fluorescent substance matrix particles ( 2 ). The color of light emitted from a fluorescent substance of zinc sulfide having a crystal structure of, for example, hexagonal crystal can be improved by such a particle structure. Alternatively, unwanted light emission attributed to an electron beam on the low voltage side of the fluorescent substance for display unit ( 1 ) can be suppressed.