Semiconductor light-emitting device
View Patent ↗A semiconductor light-emitting device includes: a hollow body including a bottom wall and a surrounding wall cooperating with the bottom wall to define an encapsulant-receiving recess, the bottom wall being formed with a through-hole, the surrounding wall having a diffuse surface that surrounds the encapsulant-receiving recess; a heat-dissipating body provided on a bottom side of the bottom wall and covering the through-hole in the bottom wall; a light-emitting chip disposed in the through-hole in the bottom wall; a transparent encapsulant filling the encapsulant-receiving recess and the through-hole; and a wavelength-converting layer covering the transparent encapsulant.
1. A semiconductor light-emitting device comprising:
a hollow body including a bottom wall and a surrounding wall extending upwardly from a periphery of said bottom wall, said bottom wall being formed with a through-hole, said surrounding wall cooperating with said bottom wall to define an encapsulant-receiving recess in spatial communication with said through-hole, said surrounding wall having a diffuse surface that surrounds said encapsulant-receiving recess and that has a reflectivity composed of a diffuse reflectivity and a specular reflectivity, the diffuse reflectivity being larger than the specular reflectivity;
a heat-dissipating body provided on a bottom side of said bottom wall and covering said through-hole in said bottom wall;
a light-emitting chip disposed in said through-hole in said bottom wall for generating a light in said hollow body, and supported on said heat-dissipating body;
a transparent encapsulant filling said encapsulant-receiving recess and said through-hole to enclose said light-emitting chip; and
a wavelength-converting layer that is capable of converting the wavelength of the light into a desired wavelength and that covers said transparent encapsulant.
2. The semiconductor light-emitting device of claim 1 , wherein said bottom wall is formed with a light-blocking protrusion protruding from a periphery of said through-hole into said encapsulant-receiving recess for blocking a scattered light reflected from said diffuse surface from entering said through-hole in said bottom wall.
3. The semiconductor light-emitting device of claim 2 , wherein said bottom side of said bottom wall is formed with an accommodating recess in spatial communication with said through-hole, said heat-dissipating body being fitted into said accommodating recess.
4. The semiconductor light-emitting device of claim 1 , further comprising a lead frame connected to said light-emitting chip, disposed on an exterior of said hollow body, and spaced apart from said heat-dissipating body.
5. The semiconductor light-emitting device of claim 1 , wherein said transparent encapsulant has a refractive index not greater than that of said wavelength-converting layer.
6. The semiconductor light-emitting device of claim 5 , wherein the refractive index of said transparent encapsulant is not greater than that of said light-emitting chip.
7. The semiconductor light-emitting device of claim 1 , wherein said transparent encapsulant has a refractive index not greater than that of said light-emitting chip.
8. The semiconductor light-emitting device of claim 1 , wherein said transparent encapsulant includes inner and outer encapsulant layers, said inner encapsulant layer being received in said through-hole in said bottom wall, said outer encapsulant layer being received in said encapsulant-receiving recess, said outer encapsulant layer having a refractive index less than that of said wavelength-converting layer.
9. The semiconductor light-emitting device of claim 1 , wherein said transparent encapsulant includes inner and outer encapsulant layers, said inner encapsulant layer being received in said through-hole in said bottom wall, said outer encapsulant layer being received in said encapsulant-receiving recess, said outer encapsulant layer having a refractive index less than that of said inner encapsulant layer.
10. The semiconductor light-emitting device of claim 9 , wherein said inner encapsulant layer has a refractive index not greater than that of said light-emitting chip.
11. The semiconductor light-emitting device of claim 1 , wherein said through-hole in said bottom wall has a rectangular periphery.
12. The semiconductor light-emitting device of claim 1 , wherein said transparent encapsulant is made from a high transmittance material selected from one of a resin and a gel material.
13. The semiconductor light-emitting device of claim 12 , wherein said high transmittance material is one of epoxy resin and silica gel.
14. The semiconductor light-emitting device of claim 1 , wherein said diffuse surface of said surrounding wall of said hollow body is a roughened surface.
15. The semiconductor light-emitting device of claim 1 , wherein said bottom side of said bottom wall is formed with an accommodating recess in spatial communication with said through-hole, said heat-dissipating body being fitted into said accommodating recess.
16. The semiconductor light-emitting device of claim 1 , wherein said light-emitting chip is a light emitting diode.
17. The semiconductor light-emitting device of claim 1 , wherein said hollow body is made from a composite of a polymer material and a glass fiber.
18. The semiconductor light-emitting device of claim 17 , wherein said polymer material has at least one functional group selected from one of epoxy group, C 1 -C 6 alkyl group, phenyl group, and amino group.
19. The semiconductor light-emitting device of claim 1 , wherein said wavelength-converting layer is made from a material selected from one of a fluorescent material and a phosphorous-containing material.
20. The semiconductor light-emitting device of claim 1 , wherein said heat dissipating body is made from a metallic material.