Fluorescent substance, method for manufacturing the same and image display device
AssigneeNational Institute for Materials Science
InventorNaoto HIROSAKI
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Abstract
A fluorescent substance includes a crystal of nitride or oxy-nitride having a β-type Si3N4 crystal structure having Eu+2 solid-dissolved into it and emitting a fluorescent light having a peak within a range of 500 nm to 600 nm in wavelength by being irradiated with an excitation source. The fluorescent substance further includes another crystalline or amorphous compound different from the nitride or oxy-nitride crystal and a quantity of the nitride or oxy-nitride crystal contained in the fluorescent substance is 50 wt % or more.
Claims21
A fluorescent substance comprising a crystal of nitride or oxy-nitride having a β-type Si3N4 crystal structure having Eu+2 solid-dissolved into it and emitting a fluorescent light having a peak within a range of 500 nm to 600 nm in wavelength by being irradiated with an excitation source,
- wherein said fluorescent substance further comprises another crystalline or amorphous compound different from said nitride or oxy-nitride crystal and a quantity of said nitride or oxy-nitride crystal contained in said fluorescent substance is 50 wt % or more.
A fluorescent substance manufacturing method for manufacturing a fluorescent substance comprising a crystal of nitride or oxy-nitride having a β-type Si3N4 crystal structure having Eu+2 solid-dissolved into it and emitting a fluorescent light having a peak within a range of 500 nm to 600 nm in wavelength by being irradiated with an excitation source,
- said method comprising a process of burning a raw material mixture containing metal, oxide, carbonate, nitride, fluoride, chloride or oxy-nitride of Eu, silicon nitride and aluminum nitride at a temperature of 1820° C. to 2200° C. in a nitrogen atmosphere,
- wherein said raw material mixture contains an inorganic compound forming a liquid phase at a temperature not higher than the burning temperature in said process of burning.
Dependencies are inferred from the claim text.