Line emission penetration phosphor for multicolored displays

H - Electricity – 01 – J

Patent

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316/13, 313/35.1

H01J 29/18 (2006.01) H01J 9/20 (2006.01) H01J 9/22 (2006.01) H01J 29/26 (2006.01)

Patent

CA 1195721

ABSTRACT OF THE DISCLOSURE A single particle penetration phosphor employs La2O2S:Tb particles as a core particle having a thin layer of La2O2SO4:Tb formed thereon by oxidation to provide a barrier which must be penetrated by excitation electrons to produce narrow bandwidth green spectral emission from the particle. The thin barrier is in turn coated by a layer of YVO4:Eu particles which produce narrow bandwidth red spectral emission upon electrode excitation. The barrier layer 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 synthesizing the above single particle penetration phosphor.

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