Gallium nitride phosphor, its method of manufacture, and a display device using the phosphor
AssigneesNichia Corporation, Futaba Corporation
InventorsHiroto Tamaki, Masatoshi Kameshima, Yoshitaka Sato
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Abstract
This invention presents a gallium nitride phosphor with superior light emitting characteristics, its method of manufacture, and a display device which uses the phosphor. By heat treatment or microwave irradiation of gallium nitride phosphor powder in an ambient containing essentially no H2 or H2O, a phosphor is produced wherein the amount of H2 and H2O gas evolved when heated in a vacuum is less than or equal to 0.2 cm3/g of phosphor and 2.0 cm3/g of phosphor respectively.
Claims20
A gallium nitride phosphor wherein the amount of H2 gas evolved when heated in a vacuum is less than or equal to 0.2 cm3/g of phosphor.
A gallium nitride phosphor wherein the amount of H2 gas evolved when heated in a vacuum-is less than or equal to 0.15 cm3/g of phosphor.
A gallium nitride phosphor wherein the amount of H2 gas evolved when heated in a vacuum is less than or equal to 0.1 cm3/g of phosphor.
A method of manufacture of gallium nitride phosphor wherein gallium nitride phosphor powder is heat treated in an ambient containing essentially no H2 or H2O at a temperature of 500° C. to 1100° C. for a period greater than or equal to 10 min., and the amount of H2 gas evolved when the phosphor is heated in a vacuum is less than or equal to 0.2 cm3/g of phosphor.
A method of manufacture of gallium nitride phosphor wherein gallium nitride phosphor powder is irradiated with microwaves in an ambient containing essentially no H2 or H2O, and the amount of H2 gas evolved when the phosphor is heated in a vacuum is less than or equal to 0.2 cm3/g of phosphor.
A display device which uses a gallium nitride phosphor wherein the amount of H2 gas evolved when the phosphor is heated in a vacuum is less than or equal to 0.2 cm3/g of phosphor.
Dependencies are inferred from the claim text.