Droop-free high output light emitting devices and methods of fabricating and operating same
AssigneeCree, Inc.
InventorJohn Adam Edmond
Life of this patent
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Abstract
Light emitting devices include a semiconductor light emitting diode that is configured to operate at a substantially droop-free quantum efficiency while producing warm white light output of at least about 100 lumens/cool white light output of at least about 130 lumens. The semiconductor light emitting diode may include a single semiconductor die of at least about 4 mm2 in area that operates at a current density of less than about 9 A/cm2, so as to operate at the substantially droop-free quantum efficiency. Related fabricating and operating methods are also disclosed.
Claims14
A light emitting device comprising:
- a semiconductor light emitting diode comprising a single semiconductor die that is configured to operate at a substantially droop-free quantum efficiency that has less than about 5% deviation from linearity of quantum efficiency while producing warm white light output of at least about 100 lumens/cool white light output of at least about 130 lumens.
A method of fabricating a light emitting device that can produce at least about 100 lumens of warm white light/at least about 130 lumens of cool white light comprising:
- increasing a die size of a semiconductor light emitting diode die to at least about 4 mm2 and reducing operating current density in the semiconductor light emitting diode die to less than about 9 A/cm2 to operate the semiconductor light emitting diode die at a substantially droop-free quantum efficiency that has less than about 5% deviation from linearity of quantum efficiency.
A method of operating a light emitting device to produce at least about 100 lumens of warm white light/at least about 130 lumens of cool white light comprising:
- reducing operating current density in a semiconductor light emitting diode die having a die size of at least about 4 mm2 to less than about 9 A/cm2 so as to operate the semiconductor light emitting diode die at a substantially droop-free quantum efficiency that has less than about 5% deviation from linearity of quantum efficiency.
Dependencies are inferred from the claim text.