Light emitting device
First Claim
1. A wavelength converter comprising:
- a substrate; and
a phosphor layer,wherein the phosphor layer includes a plurality of polyhedral phosphor particles, each of the polyhedral phosphor particles is monodispersed, is derived from a crystal structure of garnet and has facets,a median particle size D50 of the plurality of polyhedral phosphor particles is 30 μ
m or more,the facets of the polyhedral phosphor particles and a flat surface of the substrate are substantially parallel to each other, andheat generated in the phosphor particles contained in the phosphor layer propagates to the substrate via the facets.
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Abstract
A light emitting device 1 includes: a substrate 30; and a phosphor layer 40 composed in such a manner that a large number of phosphor particles 60 are adhered onto a flat surface 32 of the substrate 30. At least one of the phosphor particles 60 is a polyhedral phosphor particle 65 that is monodispersed, is derived from a crystal structure of garnet and has facets, and a median particle size D50 of the polyhedral phosphor particle 65 is 30 μm or more and a maximum thickness of the phosphor layer 40 or less. It is preferable that at least one of the phosphor particles 60 adhered onto the flat surface 32 of the substrate 30 is the polyhedral phosphor particle 65 that is monodispersed, is derived from the crystal structure of the garnet, and has the facets.
15 Citations
19 Claims
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1. A wavelength converter comprising:
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a substrate; and a phosphor layer, wherein the phosphor layer includes a plurality of polyhedral phosphor particles, each of the polyhedral phosphor particles is monodispersed, is derived from a crystal structure of garnet and has facets, a median particle size D50 of the plurality of polyhedral phosphor particles is 30 μ
m or more,the facets of the polyhedral phosphor particles and a flat surface of the substrate are substantially parallel to each other, and heat generated in the phosphor particles contained in the phosphor layer propagates to the substrate via the facets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification