Phosphor with laminated coating, its manufacture method and light emitting device using same
First Claim
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1. A phosphor made of phosphor particles coated with inorganic substance lamination, the lamination comprising:
- an inner coating layer that is relatively thin and transparent, formed by a first film forming method and coated on said phosphor particle; and
an outer coating layer that is relatively thick and transparent, made of one or more of SiO2, Al2O3 and SiON, having a thickness of about 10 nm to about 500 nm, formed by a second film forming method different from said first film forming method and coated over an outer surface of said phosphor particle having said inner coating layer thereon.
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Abstract
A phosphor made of phosphor particles coated with inorganic substance lamination, wherein an outermost layer is a transparent layer made of one or more of SiO2, Al2O3 and SiON, having a thickness of about 10 nm to about 500 nm, and formed by fluidized bed CVD, and a transparent inner coating layer is formed inside the outermost layer by a method different from the fluidized bed CVD. The inner coating may be formed by nonaqueous method not using a water content, for example sintering super-fine particles distributed on phosphor particles.
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Citations
28 Claims
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1. A phosphor made of phosphor particles coated with inorganic substance lamination, the lamination comprising:
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an inner coating layer that is relatively thin and transparent, formed by a first film forming method and coated on said phosphor particle; and
an outer coating layer that is relatively thick and transparent, made of one or more of SiO2, Al2O3 and SiON, having a thickness of about 10 nm to about 500 nm, formed by a second film forming method different from said first film forming method and coated over an outer surface of said phosphor particle having said inner coating layer thereon. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light emitting device comprising:
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a blue or ultraviolet light emitting diode; and
a host element containing a phosphor, over the light emitting diode, wherein said phosphor is made of phosphor particles coated with inorganic substance lamination, the lamination comprising;
an inner coating layer that is relatively thin and transparent, formed by a first film forming method and coated on said phosphor particle; and
an outer coating layer that is relatively thick and transparent, made of one or more of SiO2, Al2O3 and SiON, having a thickness of about 10 nm to about 500 nm, formed by a second film forming method and coated over an outer surface of said phosphor particle having said inner coating layer thereon. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of manufacturing a phosphor, comprising:
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forming an inner coating layer that is relatively thin and transparent by a first film forming method on phosphor particles; and
forming an outer coating layer that is relatively thick and transparent made of one or more of inorganic substances SiO2, Al2O3 and SiON and having a thickness of about 10 nm to about 500 nm, by a second film forming method different from said first film forming method, over said phosphor particles having said inner coating layer thereon. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A light conversion material, comprising:
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light conversion particles that convert light of a first spectrum to light of a second spectrum;
for each of the light conversion particles, a first layer covering a substantially entire surface of the light conversion particle; and
for each of the light conversion particles, a second layer covering a substantially entire surface of the first layer. - View Dependent Claims (24, 25)
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26. A light emitting device, comprising:
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a light emitting diode for emitting light of a first spectrum; and
a host element over the light emitting diode, the host element including a light conversion element wherein a light conversion element includes;
light conversion particles that convert said light of the first spectrum to light of a second spectrum;
for each of the light conversion particles, a first layer covering a substantially entire surface of the light conversion particle; and
for each of the light conversion particles, a second layer covering a substantially entire surface of the first layer. - View Dependent Claims (27, 28)
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Specification