Polarized light emitting device

• US 20060043400A1
• Filed: 08/23/2005
• Published: 03/02/2006
• Est. Priority Date: 08/31/2004
• Status: Abandoned Application

• Current Assignee: Luminus Devices Incorporated (Sanan Optoelectronics Company Limited)
• Original Assignee: Luminus Devices Incorporated (Sanan Optoelectronics Company Limited)
• Inventors: Lim, Michael, Erchak, Alexei A., Lidorikis, Elefterios, Venezia, Jo A.
• Application Number:
  US11/209,905
• Publication Number:
  US 20060043400A1
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/49111 the connectors connecting two common bonding areas, e.g. Litz or braid wires
• CPC Class Codes: H01L 2933/0083 Periodic patterns for optical field-shaping in or on the semiconductor body or semiconductor body package, e.g. photonic bandgap structures
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/868 Arrangements for polarized light emission H10K50/86 takes precedence
• CPC Class Codes: H10K 59/875 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 59/877 comprising scattering means
• CPC Class Codes: H10K 59/8793 Arrangements for polarized light emission H10K59/8791 takes precedence

Abstract

Light-emitting devices, and related components, processes, systems and methods are disclosed.

Claims

1. A light-emitting device comprising:

a multi-layer stack of materials including a light-generating region;

a first layer supported by the light-generating region; and

a second layer of reflective material that supports the light-generating region;

wherein;

a surface of the first layer is configured so that light generated by the light-generating region can emerge from the light-emitting device via the surface of the first layer;

the second layer being a layer that varies spatially according to a first pattern such that light of a first polarization generated by the light-generating region is at least partially suppressed in relation to light of a second polarization generated by the light generating region.

2. The light-emitting device of claim 1, wherein the second layer includes a material which conducts heat.

3. The light-emitting device of claim 1, wherein the second layer includes a metal.

4. The light-emitting device of claim 1, wherein the multi-layer stack of materials comprises a multi-layer stack of semiconductor materials.

5. The light-emitting device of claim 4, wherein the first layer comprises a layer of n-doped semiconductor material, and the multi-layer stack further comprises a layer of p-doped semiconductor material.

6. The light-emitting device of claim 5, wherein the light-generating region is between the layer of n-doped semiconductor material and the layer of p-doped semiconductor material.

7. The light-emitting device of claim 1, wherein reflective material is capable of reflecting at least about 50% of light generated by the light-generating region that impinges on the layer of reflective material, the layer of reflective material being between the support and the multi-layer stack of materials.

8. The light-emitting device of claim 1, further including a current-spreading layer between the first layer and the light-generating region.

9. The light-emitting device of claim 1, wherein the first layer is an un-patterned layer.

10. The light-emitting device of claim 1, wherein the surface of the first layer has a dielectric function that varies spatially according to a second pattern.

11. The light-emitting device of claim 10, wherein the second pattern does not extend into the light-generating region.

12. The light-emitting device of claim 10, wherein the second pattern does not extend beyond the first layer.

13. The light-emitting device of claim 10, wherein the second pattern extends beyond the first layer.

14. The light-emitting device of claim 10, wherein the second pattern is partially formed of a component selected from the group consisting of holes in the surface of the first layer, pillars in the first layer, continuous veins in the first layer, discontinuous veins in the first layer and combinations thereof.

15. The light-emitting device of claim 10, wherein the second pattern is selected from the group consisting of triangular patterns, square patterns, circles, and grating patterns.

16. The light-emitting device of claim 10, wherein the second pattern comprises a periodic pattern.

17. The light-emitting device of claim 10, wherein the second pattern comprises a non-periodic pattern.

18. The light-emitting device of claim 10, wherein the second pattern is partially formed of holes in the surface of the first layer.

19. The light-emitting device of claim 10, wherein the surface of the first layer has a dielectric function that varies spatially according to a second pattern so that light emitted by the light-emitting region is more collimated than a Lambertian distribution.

20. The light-emitting device of claim 1, wherein the surface of the first layer comprises an irregular surface.

21. The light-emitting device of claim 20 wherein the surface of the first layer comprises a surface having an RMS value from about 10 nm and about 200 nm.

22. The light-emitting device of claim 1, wherein the multi-layer stack of materials comprise semiconductor materials selected from the group consisting of III-V semiconductor materials, organic semiconductor materials and silicon.

23. The light-emitting device of claim 1, wherein the light-emitting device comprises a light emitting diode.

24. The light-emitting device of claim 1, wherein the light-emitting device is selected from the group consisting of light-emitting diodes, lasers, optical amplifiers, OLEDs, flat surface-emitting LEDs, HBLEDs, and combinations thereof.

25. The light-emitting device of claim 1, wherein the surface of the first layer varies spatially according to a second pattern such that light of a first polarization generated by the light-generating region is at least partially suppressed in relation to light of a second polarization generated by the light generating region.

26. The light-emitting device of claim 25, wherein the first layer is configured such that light of at least one polarization is at least partially reflected from the first layer and at least partially reabsorbed in the light-emitting region.

27. The light-emitting device of claim 25, wherein the first layer is configured such that light of at least one polarization is at least 50% reflected from the first layer.

28. The light-emitting device of claim 1, further comprising a package, wherein the package includes a layer configured such that light generated by the light emitting device selectively passes through the polarization selective layer based on the polarization of the light.

29. The light-emitting device of claim 28, wherein light of at least one polarization is at least partially reflected from the polarization selective layer and at least partially reabsorbed in the light-emitting region.

30. The light-emitting device of claim 29, wherein light of at least one polarization is at least 50% reflected from the polarization selective layer and at least 10% reabsorbed in the light-emitting region.

31. The light-emitting device of claim 30, wherein light of at least one polarization is at least 70% reflected from the polarization selective layer and at least 10% reabsorbed in the light-emitting region.

32. The light-emitting device of claim 30, wherein light of at least one polarization is at least 90% reflected from the polarization selective layer and at least 10% reabsorbed in the light-emitting region.

33. The light-emitting device of claim 1, wherein the first pattern in the second layer of reflective material extends into the multi-layer stack.

34. The light-emitting device of claim 1, wherein the first pattern does not extend into the light-generating region.

35. The light-emitting device of claim 1, wherein the first pattern extends into the light-generating region.

36. The light-emitting device of claim 1, wherein the first pattern is selected from the group consisting of gratings, grooves, and elongated mesas.

37. The light-emitting device of claim 1, wherein the first pattern in the second layer of reflective material results in a corresponding pattern in the minimum distance between the layer of reflective material and the light generating region.

38. The light-emitting device of claim 37, wherein the first pattern comprises a periodic pattern.

39. The light-emitting device of claim 37, wherein the first pattern comprises a non-periodic pattern.

40. The light-emitting device of claim 1, wherein the second layer of reflective material is continuous.

41. The light-emitting device of claim 1, wherein the second layer of reflective material is discontinuous.

42. The light-emitting device of claim 33, wherein the second layer includes a material which conducts heat.

43. The light-emitting device of claim 33, wherein the second layer includes a metal.

44. The light-emitting device of claim 33, wherein the multi-layer stack of materials comprises a multi-layer stack of semiconductor materials.

45. The light-emitting device of claim 44, wherein the first layer comprises a layer of n-doped semiconductor material, and the multi-layer stack further comprises a layer of p-doped semiconductor material.

46. The light-emitting device of claim 45, wherein the light-generating region is between the layer of n-doped semiconductor material and the layer of p-doped semiconductor material.

47. The light-emitting device of claim 45, further comprising a transparent layer disposed in at least some of the etched regions in the first pattern.

48. The light-emitting device of claim 45, wherein the first layer is an un-patterned layer.

49. The light-emitting device of claim 45, wherein the surface of the first layer has a dielectric function that varies spatially according to a second pattern.

50. The light-emitting device of claim 45, wherein the surface of the first layer has a dielectric function that varies spatially according to a second pattern so that light emitted by the light-emitting region is more collimated than a Lambertian distribution.

51. The light-emitting device of claim 49, wherein the second pattern does not extend into the light-generating region.

52. The light-emitting device of claim 49, wherein the second pattern does not extend beyond the first layer.

53. The light-emitting device of claim 49, wherein the second pattern extends beyond the first layer.

54. The light-emitting device of claim 49, wherein the second pattern is partially formed of a component selected from the group consisting of holes in the surface of the first layer, pillars in the first layer, continuous veins in the first layer, discontinuous veins in the first layer and combinations thereof.

55. The light-emitting device of claim 49, wherein the second pattern is selected from the group consisting of triangular patterns, square patterns, circles, and grating patterns.

56. The light-emitting device of claim 49, wherein the second pattern is a periodic pattern.

57. The light-emitting device of claim 49, wherein the second pattern is a non-periodic pattern.

58. The light-emitting device of claim 49, wherein the second pattern is partially formed of holes in the surface of the first layer.

59. The light-emitting device of claim 33, wherein the multi-layer stack of materials comprise semiconductor materials selected from the group consisting of III-V semiconductor materials, organic semiconductor materials and silicon.

60. The light-emitting device of claim 33, wherein the light-emitting device comprises a light emitting diode.

61. The light-emitting device of claim 33, wherein the light-emitting device is selected from the group consisting of light-emitting diodes, lasers, optical amplifiers, OLEDs, flat surface-emitting LEDs, HBLEDs, and combinations thereof.

62. The light-emitting device of claim 33, wherein the surface of the first layer varies spatially according to a second pattern such that light of a first polarization generated by the light-generating region is at least partially suppressed in relation to light of a second polarization generated by the light generating region.

63. The light-emitting device of claim 62, wherein light of at least one polarization is at least partially reflected from the first layer and at least partially reabsorbed in the light-emitting region.

64. The light-emitting device of claim 63, wherein the first layer is configured such that light of at least one polarization is at least 50% reflected from the first layer and at least 10% reabsorbed in the light-emitting region.

65. The light-emitting device of claim 33, further comprising a package that includes a polarization selective layer configured so that light generated by the light emitting device selectively passes through the polarization selective layer based on the polarization of the light.

66. The light-emitting device of claim 65, wherein light of at least one polarization is at least partially reflected from the polarization selective layer and at least partially reabsorbed in the light-emitting region.

67. The light-emitting device of claim 66, wherein light of at least one polarization is at least 50% reflected from the polarization selective layer and at least 10% reabsorbed in the light-emitting region.

68. The light-emitting device of claim 66, wherein light of at least one polarization is at least 70% reflected from the polarization selective layer and at least 10% reabsorbed in the light-emitting region.

69. The light-emitting device of claim 66, wherein light of at least one polarization is at least 90% reflected from the polarization selective layer and at least 10% reabsorbed in the light-emitting region.

70. The light-emitting device of claim 33 wherein the package comprises a birefringment layer.

71. The light-emitting device of claim 1 further comprising birefringment layer supported by the surface of the first layer.

72. A method comprising:

activating the plurality of light emitting diodes so that;

at least a first one of the plurality of light emitting diodes emits polarized light of a first polarization; and

at least a second one of the plurality of light emitting diodes emits polarized light of a second polarization that is different from the first polarization.

73. The method of claim 72, further comprising illuminating a microdisplay using the plurality of light emitting diodes.

74. The method of claim 72, further comprising illuminating at least two microdisplays using the plurality of light emitting diodes.

75. The method of claim 72, further comprising illuminating at least two microdisplays each with a different light-emitting diode from the plurality of light emitting diodes.

76. The method of claim 72, further comprising simultaneously illuminating a plurality of microdisplays to create a three dimensional display.

77. The method of claim 72, further comprising sequentially illuminating the same microdisplay to create a three dimensional display.

78. A method comprising:

activating the plurality of light emitting systems, the light emitting systems including an LED contained in a package, so that;

at least a first one of the plurality of light emitting systems emits polarized light of a first polarization; and

at least a second one of the plurality of light emitting systems emits polarized light of a second polarization that is different from the first polarization.

79. The method of claim 78, further comprising illuminating a microdisplay using the plurality of light emitting systems.

80. The method of claim 78, further comprising illuminating greater than one microdisplay using the plurality of light emitting diodes.

81. The method of claim 78, further comprising illuminating greater than one microdisplay each with a different light-emitting diode from the plurality of light emitting diodes.

82. The method of claim 78, further comprising simultaneously illuminating different microdisplays to create a 3D display.

83. The method of claim 78, further comprising sequentially illuminating the same microdisplay to create a 3D display.

84-163. -163. (canceled)