Organic light emitting devices for illumination
First Claim
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1. A method of fabricating an illumination source, capable of producing light, having a CRI value of at least about 80, the method comprising:
- fabricating a first stripe, having a first area, the first stripe comprising a first organic emissive layer, adapted to emit a first spectrum of light;
fabricating a second stripe, having a second area, the second stripe comprising a second organic emissive layer, adapted to emit a second spectrum of light;
whereineach stripe has an aspect ratio greater than about 4 and a width greater than about 0.5 mm;
the first organic emissive layer in the first stripe emits the first spectrum of light, the second organic emissive layer in the second stripe emits the second spectrum of light, and the first spectrum of light is different from the second spectrum of light when voltages are applied across the first and second stripes; and
fabricating a drive circuitry for supplying a predetermined drive current to each stripe, which achieves a combination of light emitted from the emissive layers having a CRI value of at least about 80.
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Abstract
An organic light emitting device an a method of obtaining illumination from such a device is provided. The device has a plurality of regions, each region having an organic emissive layer adapted to emit a different spectrum of light. The regions in combination emit light suitable for illumination purposes. The area of each region may be selected such that the device is more efficient than an otherwise equivalent device having regions of equal size. The regions may have an aspect ratio of at least about four. All parts of any given region may be driven at the same current.
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Citations
27 Claims
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1. A method of fabricating an illumination source, capable of producing light, having a CRI value of at least about 80, the method comprising:
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fabricating a first stripe, having a first area, the first stripe comprising a first organic emissive layer, adapted to emit a first spectrum of light; fabricating a second stripe, having a second area, the second stripe comprising a second organic emissive layer, adapted to emit a second spectrum of light;
whereineach stripe has an aspect ratio greater than about 4 and a width greater than about 0.5 mm; the first organic emissive layer in the first stripe emits the first spectrum of light, the second organic emissive layer in the second stripe emits the second spectrum of light, and the first spectrum of light is different from the second spectrum of light when voltages are applied across the first and second stripes; and fabricating a drive circuitry for supplying a predetermined drive current to each stripe, which achieves a combination of light emitted from the emissive layers having a CRI value of at least about 80. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of fabricating an illumination source, capable of producing light, having a CRI value of at least about 80, the method comprising:
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fabricating a plurality of stripes, each stripe having an area, and comprising an organic emissive layer, adapted to emit a spectrum of light, wherein each stripe has an aspect ratio greater than about 4 and a width greater than about 0.5 mm; when voltages are applied across the plurality of stripes, the stripes emit at least three different spectra of light; and fabricating a drive circuitry for supplying a predetermined drive current to each stripe, which achieves a combination of the emitted spectra of light having a CRI value of at least about 80.
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20. An organic light emitting device comprising a plurality of light-emitting regions, each of said regions comprising one organic emissive layer selected from a plurality of different organic emissive layers, wherein:
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(a) each of the plurality of emissive layers is adapted to emit a different spectrum of light; (b) the light-emitting regions are in the form of stripes having an aspect ratio greater than 4 and a width greater than 0.5 mm;
wherein the light emitting fill factor of the device exceeds 70%;(c) the drive current for each different type of emissive layer is individually adjusted;
or the different types of emissive layers have different areas;
or both; and(d) the device emits light having a CRI greater than 80 when power is provided to the plurality of light-emitting regions. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification