FLUORESCENT SUBSTANCE FOR DISPLAY DEVICE AND FIELD EMISSION TYPE DISPLAY DEVICE USING THEREOF

摘要

PROBLEM TO BE SOLVED: To inhibit a lowering of properties (a deterioration of luminance) with time due to a low accelerating voltage (3-15 kV) of electron beams or the like and maintain a good emission luminance over a long period in a fluorescent substance for a display device used in FED or the like. SOLUTION: This blue and green light-emitting fluorescent substance for the display device comprises a fluorescent substance of zinc sulfide having a crystal structure of a hexagonal system. The blue light-emitting fluorescent substance of zinc sulfide has a mean particle diameter within the range of (0.0169×VE1.9+2.49)±20% (μm) to the accelerating voltage VE of electron beams. The green light-emitting fluorescent substance of zinc sulfide has a mean particle diameter within the range of (0.017×VE1.9+2.58)±20% (μm). The red light-emitting fluorescent substance for the display device comprises an yttrium oxysulfide fluorescent substance or an yttrium oxide fluorescent substance and has a mean particle diameter within the range of (0.023×VE1.95+2.88)±20% (μm).