Wavelength conversion member and light-emitting device
AssigneeSharp Kabushiki Kaisha
InventorMasamichi Harada
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Abstract
There are provided a wavelength conversion member including phosphors made of phosphor particles which are made of an oxynitride and/or a nitride and have a refractive index n1, and a coating which coats each of the phosphor particles and has a refractive index n2, and a medium having the phosphors dispersed therein and having a refractive index n3, the refractive index n2 of the coating being a value between n3 and n1, and a light-emitting device having the wavelength conversion member incorporated therein. It is preferable in the present invention that the coating is formed of a plurality of layers, and has its refractive index varying in a stepwise manner in a direction from a surface of each of the phosphor particles to an interface with the medium.
Claims17
A wavelength conversion member comprising:
- phosphors made of (i) phosphor particles which are made of at least one of an oxynitride and a nitride and have a refractive index n1, and (ii) a coating which coats each of said phosphor particles and has a refractive index n2 said coating having multiple layers including an yttrium oxide, a magnesium oxide, an aluminum oxide, and a silicon oxide arranged on said phosphor particles in this order;
- and
- a medium having said phosphors dispersed therein and having a refractive index n3,
- wherein the refractive index n2 of the coating is a value between n3 and n1.
Dependencies are inferred from the claim text.