High output small area group III nitride LEDs
First Claim
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1. A light emitting diode comprising:
- a die with an area of 100,000 square microns or less;
an active structure formed from Group III nitride material;
a silver-based mirror layer providing electrical contact with the active structure; and
a barrier layer including a portion that surrounds the silver-based mirror layer and extends to the active structure to prevent reaction of silver with other parts of the light emitting diode,wherein the light emitting diode is operable with a forward voltage of less than 4.0 volts and approximately 20 milliamps of drive current to produce a radiant flux of at least 24 milliwatts and a dominant wavelength between 395 and 540 nanometers.
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Abstract
A light emitting diode is disclosed with advantageous output on a per unit area basis. The diode includes an area of less than 100,000 square microns, operates at a forward voltage of less than 4.0 volts, produces a radiant flux of at least 24 milliwatts at 20 milliamps drive current, and emits at a dominant wavelength between about 395 and 540 nanometers.
79 Citations
32 Claims
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1. A light emitting diode comprising:
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a die with an area of 100,000 square microns or less; an active structure formed from Group III nitride material; a silver-based mirror layer providing electrical contact with the active structure; and a barrier layer including a portion that surrounds the silver-based mirror layer and extends to the active structure to prevent reaction of silver with other parts of the light emitting diode, wherein the light emitting diode is operable with a forward voltage of less than 4.0 volts and approximately 20 milliamps of drive current to produce a radiant flux of at least 24 milliwatts and a dominant wavelength between 395 and 540 nanometers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A light emitting diode comprising:
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an active structure formed from Group III nitride material; a silver-based mirror layer providing electrical contact with the active structure; and a barrier layer including a portion that surrounds the silver-based mirror layer and extends to the active structure to prevent reaction of silver with other parts of the light emitting diode; wherein the light emitting diode is operable with a forward voltage of less than 4.0 volts and a drive current of approximately 20 milliamps to produce a radiant flux per unit area of at least 270 milliwatts per square millimeter, at a dominant wavelength of between about 395 and 540 nm. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A light emitting diode comprising:
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a polymeric package; a die in said package with an area of less than 100,000 square microns; an active structure formed from Group III nitride material, the active structure further comprising a p-type layer at the bottom; a silver-based mirror layer providing electrical contact with the active structure; and a barrier layer including a portion that surrounds the silver-based mirror layer and extends to the active structure to prevent reaction of silver with other parts of the light emitting diode, wherein the light emitting diode is operable with a forward voltage of less than 4.0 volts and a drive current of approximately 20 milliamps to produce a radiant flux per unit area of at least 270 milliwatts per square millimeter, at a dominant wavelength of between about 395 and 540 nm. - View Dependent Claims (32)
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Specification