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US 5,705,834 AGranted
Increased efficiency LED
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsClaudio O. Egalon, Robert S. Rogowski
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Abstract
In an LED a large portion of the light produced is lost due to total internal reflection at the air-semiconductor interface. A reverse taper of the semiconductor is used to change the angle at which light strikes the interface so that a greater portion of the light is transmitted.
Claims5
A light emitting diode comprising:
- two semiconductor regions forming a light producing diode junction;
- a light emitting end face;
- a first one of the two semiconductor regions forming an outer volume, surrounding a second of the two semiconductor regions;
- a base, opposed to the light emitting end face;
- a plurality of sides of the outer volume, the sides connecting the light emitting end face to the base;
- the sides further defining a reverse taper such that the cross sectional area of the light emitting diode is greater at the light emitting end face than at the base.
3 more elements
Dependencies are inferred from the claim text.