Light emitting device
First Claim
1. A white-light emitting apparatus comprising:
- a co-fired aluminum nitride substrate; and
a light emitting device arranged on a front surface of the co-fired aluminum nitride substrate,wherein the front surface of the co-fired aluminum nitride substrate, on which the light emitting device is arranged, is mirror-polished so as to have a surface roughness of 0.3 μ
m Ra or less,wherein the light emitting apparatus comprises a vapor-deposited metal film and via holes, the vapor-deposited metal film being arranged directly on the front surface of the co-fired aluminum nitride substrate around the light emitting device and having a reflectivity of 90% or more with respect to light emitted from the light emitting device, and the via holes penetrating the co-fired aluminum nitride substrate from the front surface, on which the light emitting device is arranged, to the rear surface of the co-fired aluminum nitride substrate to thereby allow an electrical conduction to the light emitting device from the rear surface to the front surface without using a wire-bonding,wherein the vapor-deposited metal film comprises aluminum or silver and has a thickness of 1 to 5 μ
m, andwherein the co-fired aluminum nitride substrate has a thickness of 0.3 to 0.6 mm.
1 Assignment
0 Petitions
Accused Products
Abstract
A light emitting apparatus 10 includes an aluminum nitride co-fired substrate 11 and a light emitting device 12 arranged on a front surface of the co-fired substrate, in which the front surface of the aluminum nitride substrate 11 bearing the light emitting device 12 is mirror-polished so as to have a surface roughness of 0.3 μm Ra or less, and the light emitting apparatus 10 further includes a vapor-deposited metal film 14 and via holes 15. The vapor-deposited metal film 14 is arranged on the front surface of the aluminum nitride substrate 11 around the light emitting device 12 and has a reflectivity of 90% or more with respect to light emitted from the light emitting device 12. The via holes 15 penetrates the aluminum nitride substrate 11 from the front surface bearing the light emitting device 12 to the rear surface to thereby allow conduction to the light emitting device 12 from the rear surface. This configuration can reduce light emitting apparatuses in size and can provide light emitting apparatuses that are excellent in heat radiation performance, allow a larger current to pass therethrough, and can have a significantly increased luminance with a high luminous efficiency.
-
Citations
9 Claims
-
1. A white-light emitting apparatus comprising:
- a co-fired aluminum nitride substrate; and
a light emitting device arranged on a front surface of the co-fired aluminum nitride substrate,wherein the front surface of the co-fired aluminum nitride substrate, on which the light emitting device is arranged, is mirror-polished so as to have a surface roughness of 0.3 μ
m Ra or less,wherein the light emitting apparatus comprises a vapor-deposited metal film and via holes, the vapor-deposited metal film being arranged directly on the front surface of the co-fired aluminum nitride substrate around the light emitting device and having a reflectivity of 90% or more with respect to light emitted from the light emitting device, and the via holes penetrating the co-fired aluminum nitride substrate from the front surface, on which the light emitting device is arranged, to the rear surface of the co-fired aluminum nitride substrate to thereby allow an electrical conduction to the light emitting device from the rear surface to the front surface without using a wire-bonding, wherein the vapor-deposited metal film comprises aluminum or silver and has a thickness of 1 to 5 μ
m, andwherein the co-fired aluminum nitride substrate has a thickness of 0.3 to 0.6 mm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a co-fired aluminum nitride substrate; and
Specification