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US 8,710,533 B2Granted
Multicolored light converting LED with minimal absorption
Assignee3M Innovative Properties Company
InventorsMichael A. Haase, Junqing Xie, Thomas J. Miller, Xiaoguang Sun
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Abstract
Light emitting systems are disclosed. More particularly light emitting systems that utilize wavelength converting semiconductor layer stacks, and preferred amounts of potential well types in such stacks to achieve more optimal performance are disclosed.
Claims20
A light emitting system, comprising:
- an LED emitting pump light of a first wavelength from an emission surface of the LED;
- and
- a semiconductor layer stack disposed on the emission surface of the LED, the semiconductor stack comprising:
- m first type potential wells that absorb the pump light and emit light of a second wavelength longer than the first wavelength, m being an integer greater than or equal to one;
- and
- n second type potential wells that absorb the pump light and emit light of a third wavelength longer than the first wavelength and shorter than the second wavelength, n being an integer greater than m;
- and
- at least one region in the semiconductor stack allowing a portion of the pump light of the first wavelength to exit the light emitting system without going through the first or second type potential wells.
5 more elements
Dependencies are inferred from the claim text.