Phosphor with laminated coating, its manufacture method and light emitting device using the 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 200 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,wherein said second film forming method is fluidized bed CVD,wherein said first film forming method is a nonaqueous method coating nanometer sized particles and sintering,wherein said inner coating layer includes at least one of TiO2, Al2O3, SiO2 and SiON, andwherein said phosphor particles include at least one of Sr1-xCaxS;
Eu and Sr1-xGa2S4;
Eu.
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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
7 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 200 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, wherein said second film forming method is fluidized bed CVD, wherein said first film forming method is a nonaqueous method coating nanometer sized particles and sintering, wherein said inner coating layer includes at least one of TiO2, Al2O3, SiO2 and SiON, and wherein said phosphor particles include at least one of Sr1-xCaxS;
Eu and Sr1-xGa2S4;
Eu. - View Dependent Claims (2)
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3. 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 200 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, wherein said second film forming method is fluidized bed CVD, wherein said first film forming method is a nonaqueous method coating nanometer sized particles and sintering, wherein said inner coating layer includes at least one of TiO2, Al2O3, SiO2 and SiON, and wherein said phosphor particles include phosphor particles made of Sr1-xCaxS;
Eu and phosphor particles made of Sr1-xGa2S4;
Eu. - View Dependent Claims (4, 5, 6, 7)
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Specification