Cathodoluminescent particles for multicolour displays and method of manufacture thereof.

摘要

A single particle penetration phosphor employs La202S:Tb particles as a core particle (14) having a thin layer of La202S04:Tb formed thereon by oxidation to provide a barrier (16) which must be penetrated by excitation electrons to produce narrow bandwidth green spectral emission from the particle. The thin barrier (16) is in turn coated by a layer (18) of YV04:Eu particles which produce narrow bandwidth red spectral emission upon electron excitation. The barrier layer (16) increases the voltage turn-on characteristic of the green carrier host, thereby causing the electron irradiated phosphor to radiate in the red spectrum for low voltages and in the green spectrum for higher voltages. Additionally, methods are disclosed for synthesising the above single particle penetration phosphor.