Lighting devices using feedback enhanced light emitting diode
First Claim
Patent Images
1. A lighting device comprising:
- a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein the first feedback layer or the second feedback layer or both the first feedback layer and the second feedback layer comprise at least a layer with a photonic crystal structure.
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Abstract
Lighting devices using feedback-enhanced luminescent devices are disclosed. A light emitting diode disposed between feedback elements (FE-LED) may be used as a light emitting element in the lighting devices. The light emitting element may be coupled to a light distribution element. In one aspect, the light emitting diode may be an organic light emitting diode (FE-OLED).
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Citations
66 Claims
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1. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein the first feedback layer or the second feedback layer or both the first feedback layer and the second feedback layer comprise at least a layer with a photonic crystal structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein the first feedback layer or the second feedback layer or both the first feedback layer and the second feedback layer comprise at least a layer of holographic recording material. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second eledctrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom. wherein the first feedback layer or the second feedback layer or both the first feedback layer and the second feedback layer comprise at least a layer of material having a plane wave interference pattern. - View Dependent Claims (37, 38)
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39. A light device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom. wherein the first feedback layer or the second feedback layer or both the first feedback layer and the second feedback layer comprise at least a layer of material having plane wave interference patterns corresponding to different wavelengths of light. - View Dependent Claims (40, 41, 42, 43, 44)
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45. A lightinh device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein the layer of luminescent material comprises two or more luminescent materials each separately patterned into geometrically shaped domains or areas in a plane of the luminescent material. - View Dependent Claims (46, 47, 48)
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49. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distributing element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein a distance between the first feedback layer and the second feedback layer is in an order of approximately one half-wavelength of emitted light.
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50. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein a distance between the first feedback layer and the second feedback layer is an order of approximately two or more half-wavelengths of emitted light.
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51. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second electrode feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein the luminescent material comprises an electroluminescent material whose spectral emission band overlaps reflection bands of the first feedback layer and the second feedback layer.
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52. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second electrode feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element dispoed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein the first and the second electrodes, and the one or more semiconducting layers are formed in a defect in a continuous photonic crystal formed by the first feedback layer and the second feedback layer. - View Dependent Claims (53, 54, 55)
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56. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein both the first feedback layer and the second feedback layer transmit no light at a peak wavelength of their spectral reflection bands and the luminescent material radiates light into band-edge laser modes.
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57. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein one or both of the first feedback layer and the second feedback layer has a refractive index profile that at least in part varies periodically along an axis normal or substantially normal to a plane of a respective feedback layer. - View Dependent Claims (58)
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59. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adaped to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein a distance between the first feedback layer and the second feedback layer is such that the space between the feedback layers constitutes a cavity in which light of one or more desired wavelengths constructively interfere.
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60. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semiconducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein light reflected by one or both of the first feedback layer and the second feedback layer stimulates emission of light from the one or more layers of luminescent material. - View Dependent Claims (61, 62)
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63. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein all light emitted by the device occupies a single light propagation mode. - View Dependent Claims (64)
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65. A light device comprising;
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode;
a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein light emitted by the device occupies two or more light propagation modes.
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66. A lighting device comprising:
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a light source comprising at least;
a first feedback layer adapted to receive and reflect light;
a first electrode formed on the first feedback layer;
one or more semiconducting layers formed over the first electrode, at least one of the one or more semi-conducting layers comprising luminescent material;
a second electrode disposed over the one or more semiconducting layers; and
a second feedback layer adapted to receive and reflect light disposed over the second electrode; and
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a light distribution element disposed adjacent to one or both of the first feedback layer and the second feedback layer and adapted to distribute light emitted therefrom, wherein one or both of the first feedback layer and the second feedback layer comprises refractive index profiles that have superimposed multiple periodic spatial frequencies of variation.
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Specification