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Google patents microLEDs using aluminum to shift light color

This patent describes a method for making tiny light-emitting diodes (microLEDs) that use aluminum in their core layers. By adding aluminum, the LEDs produce light with a longer wavelength, which helps create specific colors like red or green.

Why it mattersThis technology could lead to more efficient and colorful screens for phones and TVs by improving how individual pixels are made.

In the filing’s own words

A light-emitting diode (LED) structure includes an active region that has at least one aluminum-containing quantum well (QW) stack that emits light from the LED structure when activated. The LED structure exhibits a modified internal quantum efficiency value, which is higher than a LED structure that does not include aluminum within a QW stack. The LED structure also exhibits a modified peak wavelength, which is longer than an unmodified peak wavelength of the unmodified LED structure.

What exactly they claim (claim 1)

1. A display, comprising: a plurality of microLED structures monolithically formed on a substrate template as an array, the plurality of microLED structures including a blue microLED structure configured to emit light at a blue wavelength, a green microLED structure configured to emit light at a green wavelength, and a red microLED structure configured to emit light at a red wavelength, a microLED structure of the plurality of microLED structures including: a bulk or prep layer formed on a semiconductor template; an active region formed on the bulk or prep layer and including: a first barrier layer formed on the bulk or prep layer; at least one active quantum well (QW) stack including aluminum formed on the first barrier layer; and a second barrier layer formed on the at least one active QW stack; and at least one p-layer formed on the active region, wherein the active region emits light from the microLED structure when the at least one active QW stack is driven by an injection current.

Facts

Company
Google (GOOGLE LLC)
Official title
Light emitting diodes with aluminum-containing layers integrated therein and associated methods
Patent number
US12740186B2
Application number
17307561
Filed
May 4, 2021
Granted
Sep 15, 2026
Inventors
6
Claims
29

Classified under

H10H 20/812 Electricity & electronicsH10H 20/01 Electricity & electronicsH10H 20/8162 Electricity & electronicsH10H 20/825 Electricity & electronicsH10H 20/841 Electricity & electronicsH10H 29/142 Electricity & electronics
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.