Transparent substrate light emitting diodes with directed light output
AssigneeHewlett-Packard Company
InventorsFred A. Kish, Jr., Stephen A. Stockman
Life of this patent
Estimating the term…
Loading patent…
AssigneeHewlett-Packard Company
InventorsFred A. Kish, Jr., Stephen A. Stockman
Estimating the term…
Methods for the fabrication of TS LED chips with improved light extraction and optics, particularly increased top surface emission, and the TS LEDs so fabricated are described. Non-absorbing DBRs within the chip permit the fabrication of the LEDs. The transparent DBRs redirect light away from absorbing regions such as contacts within the chip, increasing the light extraction efficiency of the LED. The non-absorbing DBRs can also redirect light toward the top surface of the chip, improving the amount of top surface emission and the on-axis intensity of the packaged LED. These benefits are accomplished with optically non-absorbing layers, maintaining the advantages of a TS LED, which advantages include .about.6 light escape cones, and improved multiple pass light extraction.
A light emitting diode that does not emit coherent radiation, comprising:
Dependencies are inferred from the claim text.