Light-radiating semiconductor component with a luminescence conversion element

• US 6,812,500 B2
• Filed: 12/06/2000
• Issued: 11/02/2004
• Est. Priority Date: 06/26/1996
• Status: Expired due to Term

• Current Assignee: OSRAM Licht AG (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Reeh, Ulrike, Schlotter, Peter, Schmidt, Ralf, Waitl, Günter, Schneider, Jürgen, Höhn, Klaus, Stath, Norbert
• Primary Examiner(s): JACKSON JR, JEROME
• Application Number:
  US09/731,220
• Publication Number:
  US 20010000622A1
• Time in Patent Office: 1,427 Days
• Field of Search: 257/98, 257/99, 257/100, 257/103
• US Class Current: 257/98
• CPC Class Codes: C09K 11/7718 with alkaline earth metals
• CPC Class Codes: C09K 11/7746 with alkaline earth metals
• CPC Class Codes: C09K 11/7767 Chalcogenides
• CPC Class Codes: C09K 11/7769 Oxides C09K11/7768 takes precedence
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/32257 the layer connector connecting to a bonding area disposed in a recess of the surface of the item
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/48465 the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 2224/48472 the other connecting portion not on the bonding area also being a wedge bond, i.e. wedge-to-wedge
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01021 Scandium [Sc]
• CPC Class Codes: H01L 2924/01079 Gold [Au]
• CPC Class Codes: H01L 2924/12041 : LED
• CPC Class Codes: H01L 2924/12044 : OLED
• CPC Class Codes: H01L 2924/181 : Encapsulation
• CPC Class Codes: H01L 2933/0091 : Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/486 : adapted for surface mounting
• CPC Class Codes: H01L 33/50 : Wavelength conversion elements
• CPC Class Codes: H01L 33/501 : characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/502 : Wavelength conversion materials
• CPC Class Codes: H01L 33/56 : Materials, e.g. epoxy or silicone resin
• CPC Class Codes: Y02B 20/00 : Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

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.

Claims

1. A light-radiating semiconductor component, comprising:

a semiconductor body emitting electromagnetic radiation during an operation of the semiconductor component, said semiconductor body having a semiconductor layer sequence suitable for emitting electromagnetic radiation of a first wavelength range selected from a spectral region consisting of ultraviolet, blue, and green;

a first electrical terminal and a second electrical terminal each electrically conductively connected to said semiconductor body;

a luminescence conversion element with at least one luminescent material, said luminescence conversion element converting a radiation originating in the first wavelength range into radiation of a second wavelength range different from the first wavelength range, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the second wavelength range;

said luminescence conversion element comprising a luminescence conversion layer produced from a silicone and containing inorganic luminescence material selected from the group consisting of garnets doped with rare earths, alkaline earth metal sulfides doped with rare earths, thiogallates doped with rare earths, aluminates doped with rare earths, and orthosilicates doped with rare earths.

7. The semiconductor component according to claim 1, 2, 3, 4, 5 or 6 wherein said luminescence conversion layer converts radiation of the first wavelength range into radiation of a plurality of second wavelength ranges from mutually different spectral subregions, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the plurality of second wavelength ranges.

8. The semiconductor component according to claim 1, 2, 3, 4, 5 or 6, wherein the semiconductor component has a defined main radiating direction, and said luminescence conversion layer is disposed substantially downstream of said semiconductor body in the main radiating direction of the semiconductor component.

38. The semiconductor component according to claim 1, 5, or 6 wherein said second wavelength range includes wavelengths at least some of which are longer than wavelengths of the first wavelength range.

39. The semiconductor component according to claim 1, 5 or 6 wherein said semiconductor body is adapted to emit ultraviolet radiation during operation of the semiconductor component, and said luminescence conversion element converts at least a portion of the ultraviolet radiation into visible light.

40. The semiconductor component according to claim 1, 5 or 6 wherein the first wavelength range and the second wavelength range of the polychromatic radiation lie at least partially in mutually complementary-color spectral regions, and a combination of radiation from the first and second wavelength range results in white light.

41. The semiconductor component according to claim 1, 5 or 6, wherein said luminescence conversion element converts radiation of the first wavelength range into radiation of a plurality of second wavelength ranges from mutually different spectral subregions, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the plurality of second wavelength ranges, wherein the first wavelength range emitted by said semiconductor body and two second wavelength ranges produce an additive color triad, such that white light is radiated by the semiconductor component during operation thereof.

42. The semiconductor component according to claim 1, 5 or 6 wherein the radiation emitted by said semiconductor body has a luminescence intensity maximum in a blue spectral region at a wavelength between 420 nm and 460 nm.

43. The semiconductor component according to claim 1 which further comprises an opaque base housing formed with a recess, and wherein said semiconductor body is disposed in said recess of said base housing, and including a covering layer having a luminescence conversion layer on said recess.

44. The semiconductor component according to claim 1, 5 or 6 which further comprises an opaque base housing formed with a recess, and wherein said semiconductor body is disposed in said recess of said base housing, and wherein said recess is at least partially filled with said luminescence conversion element.

49. The semiconductor component according to claim 1, 5 or 6, wherein the inorganic luminescent material is selected from the group of Ce-doped garnets.

50. The semiconductor component according to claim 1, 5 or 6, wherein the inorganic luminescent material is YAG:

Ce.

56. The semiconductor component according to claim 1, 5 or 6 herein said luminescence conversion element comprises at least one luminescent 4f-organometallic compound.

57. The semiconductor component according to claim 1, 5 or 6 wherein said luminescence conversion element includes a luminescent material that is luminescent in a blue region.

60. In an interior lighting of an aircraft cabin, a plurality of the light-radiating semiconductor components according to claim 1, 5 or 6.

61. The combination with a display device, a plurality of the semiconductor components according to claim 1, 5 or 6 disposed to illuminate a display of the display device.

62. The semiconductor component according to claim 7, wherein the first wavelength range emitted by said semiconductor body and two second wavelength ranges produce an additive color triad, such that white light is radiated by the semiconductor component during operation thereof.

64. The semiconductor component according to claim 1, wherein said luminescence conversion element comprises a plurality of layers with mutually different wavelength conversion properties.

65. The semiconductor component according to claim 1, wherein the inorganic luminescent material has a mean particle size of approximately 10 μ

m.

66. The semiconductor component according to claim 1, 2, 5 or 6, wherein said luminescence conversion element includes light-diffusing particles.

67. The semiconductor component according to claim 1, 2, 5 or 6 which comprises a transparent encapsulation with light-diffusing particles.

68. The semiconductor component according to claim 1, 2, 3, 4, 5 or 6, wherein said luminescence conversion element is surrounded by a further transparent encapsulation.

2. A light-radiating semiconductor component, comprising:

a semiconductor body emitting electromagnetic radiation during an operation of the semiconductor component, said semiconductor body having a semiconductor layer sequence suitable for emitting electromagnetic radiation of a first wavelength range selected from a spectral region consisting of ultraviolet, blue, and green;

a first electrical terminal and a second electrical terminal each electrically conductively connected to said semiconductor body;

a luminescence conversion element with at least one luminescent material, said luminescence conversion element converting a radiation originating in the first wavelength range into radiation of a second wavelength range different from the first wavelength range, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the second wavelength range,, wherein said second wavelength range includes wavelengths at least some of which are longer than wavelengths of said first wavelength range, and said luminescence conversion element comprises a plurality of layers with mutually different wavelength conversion properties.

9. The semiconductor component according to claim 2, wherein said luminescence conversion element is at least one luminescence conversion layer disposed in a vicinity of said semiconductor body.

10. The semiconductor component according to claim 2, wherein said luminescence conversion element is a luminescence conversion encapsulation enclosing at least a part of said semiconductor body and partial regions of said first and second electrical terminals.

18. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element includes organic dye molecules in a plastic matrix.

19. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element includes organic dye molecules in a plastic matrix, and wherein said plastic matrix is formed from a plastic material selected from the group consisting of silicone, thermoplastic material, and thermosetting plastic material.

20. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element includes organic dye molecules in a plastic matrix, and wherein said luminescence conversion element has organic dye molecules in a matrix selected from the group consisting of an epoxy resin matrix and a polymethyl methacrylate matrix.

21. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element has at least one inorganic luminescence material selected from the phosphor group.

22. The semiconductor component according to claim 2, 3 or 4, wherein the inorganic luminescent material is selected from the group of Ce-doped garnets.

23. The semiconductor component according to claim 2, 3 or 4, wherein the inorganic luminescent material is YAG:

Ce.

24. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element has at least one inorganic luminescence material selected from the phosphor group, and wherein the inorganic luminescent material is embedded in an epoxy resin matrix.

25. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element has at least one inorganic luminescence material selected from the phosphor group, and wherein the inorganic luminescent material is embedded in a matrix formed of inorganic glass with a relatively low melting point.

26. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element has at least one inorganic luminescence material selected from the phosphor group, and wherein the inorganic luminescent material is embedded in an epoxy resin matrix, and wherein the inorganic luminescent material has a mean particle size of approximately 10 μ

m.

27. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element is provided with a plurality of mutually different materials selected from the group consisting of organic and inorganic luminescent materials.

28. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element includes dye molecules selected from the group consisting of organic and inorganic dye molecules partly with and partly without a wavelength conversion effect.

29. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element comprises at least one luminescent 4f-organometallic compound.

30. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element includes a luminescent material that is luminescent in a blue region.

31. The semiconductor component according to claim 2 which comprises a transparent encapsulation with a luminescent material that is luminescent in a blue region.

32. A full-color LED display device, comprising a plurality of the light-radiating semiconductor components of claim 2, 3 or 4 arranged in a full-color LED display.

33. In an interior lighting of an aircraft cabin plurality of the light-radiating semiconductor components according to claim 2, 3 or 4.

34. The combination with a display device, a plurality of the semiconductor components according to claim 2, 3 or 4 disposed to illuminate a display of the display device.

35. The combination with a display device, a plurality of the semiconductor components according to claim 2, 3 or 4 disposed to illuminate a display of the display device,, wherein said display device includes a liquid crystal display.

54. The semiconductor component according to claim 2, 3 or 4, wherein said luminescence conversion element is provided with a plurality of mutually different materials selected from the group consisting of organic and inorganic luminescent materials.

63. The semiconductor component according to claim 2, 3, 4 or 5, wherein the radiation emitted by said semiconductor body has a luminescence intensity maximum at a wavelength λ

≦

520 nm.

3. A light-radiating semiconductor component, comprising:

a semiconductor body emitting electromagnetic radiation during an operation of the semiconductor component, said semiconductor body having a semiconductor layer sequence suitable for emitting electromagnetic radiation of a first wavelength range selected from a spectral region consisting of ultraviolet, blue, and green;

a first electrical terminal and a second electrical terminal each electrically conductively connected to said semiconductor body;

a luminescence conversion element with at least one luminescent material, said luminescence conversion element converting a radiation originating in the first wavelength range into radiation of a second wavelength range different from the first wavelength range, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the second wavelength range,, wherein said luminescence conversion element is selected from the group consisting of at least one luminescence conversion layer disposed in a vicinity of said semiconductor body and a luminescent conversion encapsulation enclosing at least a part of said semiconductor body and partial regions of said first and second electrical terminals, and wherein said luminescence conversion element includes light-diffusing particles.

11. The semiconductor component according to claim 3 or 4, wherein said second wavelength range includes wavelengths at least some of which are longer than wavelengths of the first wavelength range.

12. The semiconductor component according to claim 3 or 4, wherein said semiconductor body is adapted to emit ultraviolet radiation during operation of the semiconductor component, and said luminescence conversion element converts at least a portion of the ultraviolet radiation into visible light.

13. The semiconductor component according to claim 3 or 4, wherein the first wavelength range and the second wavelength range of the polychromatic radiation lie at least partially in mutually complementary-color spectral regions, and a combination of radiation from the first and second wavelength range results in white light.

14. The semiconductor component to claim 3 or 4, wherein said luminescence conversion element converts radiation of the first wavelength range into radiation of a plurality of second wavelength ranges from mutually different spectral subregions, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the plurality of second wavelength ranges, wherein the first wavelength range emitted by said semiconductor body and two second wavelength ranges produce an additive color triad, such that white light is radiated by the semiconductor component during operation thereof.

15. The semiconductor component according to claim 3 or 4, wherein the radiation emitted by said semiconductor body has a luminescence intensity maximum in a blue spectral region at a wavelength between 420 nm and 460 nm.

16. The semiconductor component according to claim 3 or 4, which further comprises an opaque base housing formed with a recess, and wherein said semiconductor body is disposed in said recess of said base housing, and including a covering layer having a luminescence conversion layer on said recess.

17. The semiconductor component according to claim 3 or 4, which further comprises an opaque base housing formed with a recess, and wherein said semiconductor body is disposed in said recess of said base housing, and wherein said recess is at least partially filled with said luminescence conversion element.

36. The semiconductor component according to claim 3, 4 or 6 wherein said luminescence conversion element is at least one luminescence conversion layer disposed in a vicinity of said semiconductor body.

37. The semiconductor component according to claim 3, 4, 5 or 6 wherein said luminescence conversion element is a luminescence conversion encapsulation enclosing at least a part of said semiconductor body and partial regions of said first and second electrical terminals.

4. A light-radiating semiconductor component, comprising:

a semiconductor body emitting electromagnetic radiation during an operation of the semiconductor component, said semiconductor body having a semiconductor layer sequence suitable for emitting electromagnetic radiation of a first wavelength range selected from a spectral region consisting of ultraviolet, blue, and green;

a first electrical terminal and a second electrical terminal each electrically conductively connected to said semiconductor body;

a luminescence conversion element with at least one luminescent material, said luminescence conversion element converting a radiation originating in the first wavelength range into radiation of a second wavelength range different from the first wavelength range, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the second wavelength range,, wherein said luminescence conversion element is selected from the group consisting of at least one luminescence conversion layer disposed in a vicinity of said semiconductor body and a luminescence conversion encapsulation enclosing at least a part of said semiconductor body and partial regions of said first and second electrical terminals, wherein a transparent encapsulation includes light diffusing particles.

5. A light-radiating semiconductor component, comprising:

a semiconductor body emitting electromagnetic radiation during an operation of the semiconductor component, said semiconductor body having a semiconductor layer sequence suitable for emitting electromagnetic radiation of a first wavelength range

selected from a spectral region consisting of ultraviolet, blue, and green;

a first electrical terminal and a second electrical terminal each electrically conductively connected to said semiconductor body;

a luminescence conversion element with at least one luminescent material, said luminescence conversion element converting a radiation originating in the first wavelength range into radiation of a second wavelength range different from the first wavelength range, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the second wavelength range;

wherein

said luminescence conversion element comprising a luminescence conversion encapsulation produced from a silicone and containing inorganic luminescence material selected from the group consisting of garnets doped with rare earths, alkaline earth metal sulfides doped with rare earths, thiogallates doped with rare earths, aluminates doped with rare earths, and orthosilicates doped with rare earths.

48. The semiconductor component according to claim 5 or 6, wherein said luminescence conversion element has at least one inorganic luminescence material selected from the phosphor group.

55. The semiconductor component according to claim 5 or 6, wherein said luminescence conversion element includes dye molecules selected from the group consisting of organic and inorganic dye molecules partly with and partly without a wavelength conversion effect.

58. The semiconductor component according to claim 5 or 6 which comprises a transparent encapsulation with a luminescent material that is luminescent in a blue region.

59. A full-color LED display device comprising a plurality of the light-radiating semiconductor components of claim 5 or 6 arranged in a full-color LED display.

69. The combination with a display device, a plurality of the semiconductor components according to claim 5 or 6 disposed to illuminate a display of the display device, wherein said display device includes a liquid crystal display.

6. A light-radiating semiconductor component, comprising:

a semiconductor body emitting electromagnetic radiation during an operation of the semiconductor component, said semiconductor body having a semiconductor layer sequence suitable for emitting electromagnetic radiation of a first wavelength range selected from a spectral region consisting of ultraviolet, blue, and green;

a first electrical terminal and a second electrical terminal each electrically conductively connected to said semiconductor body;

a luminescence conversion element with at least one luminescent material, said luminescence conversion element converting a radiation originating in the first wavelength range into radiation of a second wavelength range different from the first wavelength range, such that the semiconductor component emits polychromatic radiation comprising radiation of the first wavelength range and radiation of the second wavelength range; and

said luminescence conversion element being formed such that the radiation of the first wavelength range passes through said luminescence conversion element along a plurality of paths, the plurality of paths having a substantially equal path length inside said luminescence conversion element, and said luminescence conversion element emitting a substantial portion of the radiation of the first wavelength range and the radiation of the second wavelength range,

wherein said luminescence conversion element is directly deposited on said semiconductor body; and

wherein the radiation emitted by said semiconductor body has a luminescence intensity maximum at a wavelength of or below 520 nm.

45. The semiconductor component according to claim 6, wherein said luminescence conversion element includes organic dye molecules in a plastic matrix.

46. The semiconductor component according to claim 6, wherein said luminescence conversion element includes organic dye molecules in a plastic matrix, and wherein said plastic matrix is formed from a plastic material selected from the group consisting of silicone, thermoplastic material, and thermosetting plastic material.

47. The semiconductor component according to claim 6, wherein said luminescence conversion element includes organic dye molecules in a plastic matrix, and wherein said luminescence conversion element has organic dye molecules in a matrix selected from the group consisting of an epoxy resin matrix and a polymethyl methacrylate matrix.

51. The semiconductor component according to claim 6 wherein said luminescence conversion element has at least one inorganic luminescence material selected from the phosphor group, and wherein the inorganic luminescent material is embedded in an epoxy resin matrix.

52. The semiconductor component according to claim 6, wherein said luminescence conversion element has at least one inorganic luminescence material selected from the phosphor group, and wherein the inorganic luminescent material is embedded in a matrix formed of inorganic glass with a relatively low melting point.

53. The semiconductor component according to claim 6, wherein said luminescence conversion element has at least one inorganic luminescence material selected from the phosphor group, and wherein the inorganic luminescent material is embedded in an epoxy resin matrix, and wherein the inorganic luminescent material has a mean particle size of approximately 10 μ

m.