Light emitting diode resistant to change in operating temperature
First Claim
1. A light emitting diode comprising:
- a light emitting layer of a composition which is adapted to generate and emit light, the intensity and spectrum of which fluctuates in response to a change in temperature; and
a reflector of a composition having a light wavelength dependent characteristic by which temperature dependent fluctuations in intensity and spectrum of light emitted from said light emitting layer is compensated for, said reflector being across said light emitting layer so that direct light emitted from said light emitting layer and light which is radiated from said light emitting layer and is reflected by said reflector are emitted to the exterior of said diode.
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Accused Products
Abstract
A light emitting diode which does not readily cause an intensity of emitted light to fluctuate even when the operating temperature changes includes a substrate having thereon a light emitting layer and a reflector. The diode includes a light emitting layer which is of a composition which is adapted to generate and radiate light the intensity of which and the light emission spectrum changes of which depend on temperature. Over the light emitting layer is a reflector which is of a composition having a wavelength dependent characteristic which compensates for any such fluctuations in the light intensity and light emission spectrum of the light emitting layer. Direct light from the light emitting layer and light reflected by the reflector can be removed to the exterior of the diode to provide a light emission of uniform intensity even when the diode is subjected to changes in temperature.
50 Citations
30 Claims
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1. A light emitting diode comprising:
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a light emitting layer of a composition which is adapted to generate and emit light, the intensity and spectrum of which fluctuates in response to a change in temperature; and a reflector of a composition having a light wavelength dependent characteristic by which temperature dependent fluctuations in intensity and spectrum of light emitted from said light emitting layer is compensated for, said reflector being across said light emitting layer so that direct light emitted from said light emitting layer and light which is radiated from said light emitting layer and is reflected by said reflector are emitted to the exterior of said diode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light emitting diode comprising:
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a light emitting layer of a composition which is adapted to generate and radiate light, the optical output of which drops in response to a rise in operating temperature and the light emission spectrum moves toward a longer wavelength side; a reflector located in a position with respect to the light emitting layer to reflect light radiated from said light emitting layer and of a composition having a wavelength dependent reflectivity which becomes larger in a wavelength longer than the peak wavelength of the light emission spectrum of said light emitting layer; and a window portion allowing to be admitted to the exterior of the light emitting diode direct light from said light emitting layer and light radiated from said light emitting layer and then reflected by said reflector. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A light emitting diode comprising:
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a light emitting layer of a composition adapted to generate and radiate light, the optical output of which drops in response to a rise in operating temperature and a light emission spectrum which moves toward a shorter wavelength side; a reflector located at a position with respect to the light emitting layer to reflect light radiated from said light emitting layer and of a composition having a wavelength dependent reflectivity which becomes larger in a wavelength shorter than the peak wavelength of the light emission spectrum of said light emitting layer; and a window portion allowing the passing to the exterior of said diode direct light from said light emitting layer and light radiated from said light emitting layer and then reflected by said reflector. - View Dependent Claims (14, 15, 16, 17, 18, 20, 21, 22, 23, 24)
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19. A light emitting diode comprising:
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a light emitting layer of a composition adapted to generate and radiate light, the optical output of which increases in response to a rise in operating temperature and a light emission spectrum which moves toward a longer wavelength side; a reflector located at a position with respect to the light emitting layer to reflect light radiated from said light emitting layer and of a composition having a wavelength dependent reflectivity which becomes larger in a wavelength shorter than the peak wavelength of the light emission spectrum of said light emitting layer; and a window portion allowing to pass to the exterior of said diode direct light from said light emitting layer and light radiated from said light emitting layer and then reflected by said reflector.
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25. A light emitting diode comprising:
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a light emitting layer of a composition which is adapted to generate and radiate light, the optical output of which increases with a rise in operating temperature and a light emission spectrum which moves toward a shorter wavelength side; a reflector located at a position with respect to the light emitting layer to reflect light radiated from said light emitting layer and of a composition having a wavelength dependent reflectivity which becomes higher in a wavelength longer than the peak wavelength of the light emission spectrum of said light emitting layer; and a window portion allowing the passing to the exterior of said diode direct light from said light emitting layer and light radiated from said light emitting layer and then reflected by said reflector. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification