Light-radiating semiconductor component with a luminescene conversion element
View Patent ↗The light-radiating semiconductor component has a radiation-emitting semiconductor body and a luminescence conversion element. The semiconductor body emits radiation in the ultraviolet, blue and/or green spectral region and the luminescence conversion element converts a portion of the radiation into radiation of a longer wavelength. This makes it possible to produce light-emitting diodes which radiate polychromatic light, in particular white light, with only a single light-emitting semiconductor body. A particularly preferred luminescence conversion dye is YAG:Ce.
1. A light-radiating semiconductor component, comprising:
a semiconductor body configured to emit at least one of ultraviolet, blue, and green light; and
a luminescent material applied directly to the semiconductor body, the luminescent material configured to convert some of the light emitted from the semiconductor body to a different color, the remaining light emitted from the semiconductor body combining with the converted light to produce a light output for the semiconductor component having a mixture of colors.
2. The component of claim 1 , wherein the luminescent material is applied directly to the semiconductor body without the luminescent material being dispersed in a transparent encapsulation.
3. The component of claim 1 , wherein the luminescent material is an inorganic material.
4. The component of claim 1 , wherein the luminescent material is an inorganic material based on any of Ce-doped garnets, thiogallates, alkaline earth metal sulfides and aluminates.
5. The component of claim 1 , wherein the mixture of colors is substantially homogeneous for different radiation directions.
6. The component of claim 5 , wherein the substantially homogeneous mixture of colors creates a spatially substantially homogeneous color perception for the light output of the semiconductor component.
7. The component of claim 1 , wherein the mixture of colors produce white.
8. The component of claim 7 , wherein the semiconductor body is configured to emit blue light.
9. The component of claim 8 , wherein the luminescent material converts blue light to yellow light.
10. The component of claim 1 , further comprising a housing having a recess, wherein the semiconductor body is positioned in the recess.
11. A light-radiating semiconductor component, comprising:
a semiconductor body configured to emit at least one of ultraviolet, blue, and green light;
a luminescent material applied directly to the semiconductor body without the luminescent material being dispersed in a transparent encapsulation, the luminescent material configured to convert some of the light emitted from the semiconductor body to a different color, the remaining light emitted from the semiconductor body combining with the converted light to produce a white light output for the semiconductor component, and wherein at least about 20% of the white light output is the remaining light; and
an encapsulation applied over the luminescent material and semiconductor body.
12. A light-radiating semiconductor component, comprising:
a semiconductor body configured to emit at least one of ultraviolet, blue, and green light; and
a luminescent material applied directly to the semiconductor body without the luminescent material being dispersed in a transparent encapsulation, the luminescent material configured to convert some of the light emitted from the semiconductor body to a different color, the remaining light emitted from the semiconductor body combining with the converted light to produce a white light output for the semiconductor component.
13. Apparatus comprising:
a display device; and
one or more light-radiating semiconductor components as claimed in claim 1 disposed to illuminate the display device.
14. The apparatus of claim 13 , comprising a plurality of the light-radiating semiconductor components disposed to illuminate the display device.
15. The apparatus of claim 13 , wherein the display device is a liquid crystal display device.
16. The apparatus of claim 14 , wherein the display device is a liquid crystal display device.
17. Apparatus comprising: a display device; and one or more light-radiating semiconductor components as claimed in claim 11 disposed to illuminate the display device.
18. The apparatus of claim 17 , comprising a plurality of the light-radiating semiconductor components disposed to illuminate the display device.
19. The apparatus of claim 17 , wherein the display device is a liquid crystal display device.
20. The apparatus of claim 18 , wherein the display device is a liquid crystal display device.
21. Apparatus comprising:
a display device; and
one or more light-radiating semiconductor components as claimed in claim 12 disposed to illuminate the display device.
22. The apparatus of claim 21 , comprising a plurality of the light-radiating semiconductor components disposed to illuminate the display device.
23. The apparatus of claim 21 , wherein the display device is a liquid crystal display device.
24. The apparatus of claim 22 , wherein the display device is a liquid crystal display device.
25. The component of claim 1 , wherein the mixture of colors in the light output from the semiconductor component comprises perceptible amounts of the converted light and perceptible amounts of the remaining light.
26. The component of claim 1 , wherein the light output from the semiconductor component comprises at least one local peak in intensity corresponding to the remaining light.
27. The component of claim 26 , wherein the local peak in intensity is in a blue spectral region.
28. The component of claim 27 , wherein the local peak in intensity is at a wavelength between 420 nm and 460 nm.
29. The component of claim 27 , wherein the local peak in intensity is at a wavelength of approximately 430 nm.
30. The component of claim 27 , wherein the local peak in intensity is at a wavelength of approximately 470 nm.
31. The component of claim 1 , wherein at least about 20% of the light output from the semiconductor component is the remaining light.
32. The component of claim 1 , wherein at least about 30% of the light output from the semiconductor component is the remaining light.
33. The component of claim 1 , wherein at least about 50% of the light output from the semiconductor component is the remaining light.
34. The component of claim 1 , wherein the luminescence material excludes materials whose emission is peaked in a blue spectral region.
35. The component of claim 1 , wherein the converted light consists of light having one or more local emission peaks in the green, yellow, and red spectral regions, but not the blue spectral region.
36. The component of claim 12 , wherein the mixture of colors in the light output from the semiconductor component comprises perceptible amounts of the converted light and perceptible amounts of the remaining light.
37. The component of claim 12 , wherein the light output from the semiconductor component comprises at least one local peak in intensity corresponding to the remaining light.
38. The component of claim 37 , wherein the local peak in intensity is in a blue spectral region.
39. The component of claim 12 , wherein at least about 20% of the light output from the semiconductor component is the remaining light.
40. The component of claim 12 , wherein the luminescence material excludes materials whose emission is peaked in a blue spectral region.
41. The component of claim 12 , wherein the converted light consists of light having one or more local emission peaks in the green, yellow, and red spectral regions, but not the blue spectral region.
42. The component of claim 2 , further comprising an encapsulation applied over the luminescent material and semiconductor body.
43. The component of claim 12 , further comprising an encapsulation applied over the luminescent material and semiconductor body.