Fluorescent substance and manufacturing method thereof
AssigneesToso Company, Limited, Research Development Corporation of Japan
InventorsNobusuke Yamada, Masahito Sano
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Abstract
A fluorescent substance of which main component is comprised from 32 mol % to 35 mol % of silicon element and from 68 mol % to 65 mol % of oxygen element, and in which includes from 10 ppm to 1 wt % of silicon carbide and silicon nitride as an activator. And, a manufacturing method of the fluorescent substance by hydrolyzing silicon alkoxide by using alkali or acid catalyzer under the presence of carbon, and by heat treating the obtained precursor at the temperature of 500.degree. C. to 900.degree. C.
Claims5
A fluorescent substance of which the main component is composed of from 32 mol % to 35 mol % of silicon element comprising SiO.sub.2, silicon nitride and silicon carbide and from 68 mol % to 65 mol % of oxygen element and in which silicon carbide and silicon nitride are present in an amount of from 10 ppm to 1 wt %.
Dependencies are inferred from the claim text.