Silicate phosphor exhibiting high light emission characteristics and moisture resistance, and light emitting device
First Claim
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1. A silicate phosphor having a coating layer comprising a fluorine-containing compound on its surface which is obtained by heating a mixture comprising a silicate phosphor and ammonium fluoride in an amount of 0.5 to 15 weight parts per 100 weight parts of the silicate phosphor at a temperature in the range of 200 to 600°
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Abstract
A silicate phosphor having a coating layer comprising a fluorine-containing compound on its surface which is obtained by a method of heating a mixture of 100 weight parts of a silicate phosphor and 0.5-15 weight parts of ammonium fluoride at a temperature in the range of 200 to 600° C. exhibits high light emission intensity and high moisture resistance.
19 Citations
14 Claims
- 1. A silicate phosphor having a coating layer comprising a fluorine-containing compound on its surface which is obtained by heating a mixture comprising a silicate phosphor and ammonium fluoride in an amount of 0.5 to 15 weight parts per 100 weight parts of the silicate phosphor at a temperature in the range of 200 to 600°
- 5. A silicate phosphor having a coating layer comprising a fluorine-containing compound on its surface, wherein the coating layer has a thickness in the range of 30 to 1,500 nm.
- 9. A light-emitting device comprising a semiconductor element emitting a light having the wavelength region in the range of 350 to 430 nm and a phosphor-containing resin composition comprising a blue light-emitting phosphor, a green light-emitting phosphor and a red light-emitting phosphor, all of which emit the light in response to excitation with the light emitted by the semiconductor element, dispersed in a resinous binder, wherein at least the blue light-emitting phosphor is a silicate phosphor having a coating layer comprising a fluorine-containing compound on its surface which is obtained by heating a mixture comprising a silicate phosphor and ammonium fluoride in an amount of 0.5 to 15 weight parts per 100 weight parts of the silicate phosphor at a temperature in the range of 200 to 600°
- 12. A light-emitting device comprising a semiconductor element emitting a light having the wavelength region in the range of 350 to 430 nm and a phosphor-containing resin composition comprising a blue light-emitting phosphor, a green light-emitting phosphor and a red light-emitting phosphor, all of which emit the light in response to excitation with the light emitted by the semiconductor element, dispersed in a resinous binder, wherein at least the blue light-emitting phosphor is a silicate phosphor having a coating layer comprising a fluorine-containing compound on its surface and the coating layer has thickness in the range of 30 to 1,500 nm.
Specification