US 2026/0206382 A1 · MICROLEDS WITH NANOPATTERNED SURFACE

Abstract

An illumination device is provided to incorporate light extraction features in a micro-light emitting diode (microLED). The microLED contains a semiconductor stack that includes n-type and p-type semiconductors, and an active region therebetween. The microLED has an emitting surface from which light generated by the active region exits the microLED. The emitting surface has nanoscale patterned sapphire substrate (nanoPSS) features therein. The nanoPSS features have periodic frustoconical shapes each having a pitch of about 200 nm to about 500 nm, a height of about 200 nm P to about 500 nm, and a spacing of about 20%. Metal sidewalls extend from the emitting surface to form a trench in which the microLED is disposed. The metal sidewalls extend at a trench angle less than about 9% with respect to a normal to the emitting surface and electrically contact the n-type semiconductor.

Claims20

Dependent claims

A micro light-emitting diode (microLED) structure comprising:

a microLED comprising a semiconductor stack that includes an n-type semiconductor, a p-type semiconductor, and an active region sandwiched between the n-type semiconductor and the p-type semiconductor, the microLED having an emitting surface from which light generated by the active region exits the microLED, the emitting surface having nanoscale patterned sapphire substrate (nanoPSS) features therein;
and
metal sidewalls extending from the emitting surface of the n-type semiconductor to the p-type semiconductor and configured to electrically couple to the n-type semiconductor, the metal sidewalls forming a trench in which the microLED is disposed, the metal sidewalls being substantially reflective to the light generated by the active region.

Dependencies are inferred from the claim text.

Microleds with nanopatterned surface

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Microleds with nanopatterned surface

Life of this patent

Abstract

Claims20