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Graphene-Assisted Quasi-van der Waals Epitaxy of AlN Film on Nano-Patterned Sapphire Substrate for Ultraviolet Light Emitting Diodes

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Gallium nitride micro-light-emitting diode structured light sources for multi-modal optical wireless communications

A D Griffiths¹, J Herrnsdorf¹, J J D McKendry¹

¹Institute of Photonics, Department of Physics, University of Strathclyde, Glasgow G1 1RD, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|March 3, 2020

Summary

Micro-scale light-emitting diodes (LEDs) offer advanced optical wireless communications (OWC) and smart lighting. Their high-speed, spatially controlled arrays enable complex functions for tracking, imaging, and data transmission.

Keywords:

Gallium nitride light-emitting diodes optical wireless communications structured light

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Published on: April 1, 2020

Area of Science:

Optoelectronics
Solid-state lighting
Optical wireless communications

Background:

Gallium nitride (GaN)-based LEDs are key for efficient blue and green light generation.
Broad-area LEDs dominate lighting, but micro-scale LEDs (micro-LEDs) offer unique advantages.
Micro-LEDs are crucial for optical wireless communications (OWC) and advanced smart lighting.

Purpose of the Study:

To explore the advantages of micro-LEDs over traditional LEDs.
To highlight the potential of micro-LED arrays in OWC and smart lighting.
To detail the methods for achieving temporal and spatial control in micro-LED systems.

Main Methods:

Fabrication of micro-LEDs in array formats.
Bonding micro-LED arrays to complementary metal-oxide-semiconductor (CMOS) control electronics.
Utilizing micro-LEDs as digital-to-light converters for structured light patterns.

Main Results:

Micro-LEDs enable high current density operation, leading to high modulation bandwidths and optical power density.
Array formats allow tailored device layouts for specific OWC applications.
Integrated micro-LED chips provide precise temporal and spatial control for advanced functionalities.

Conclusions:

Micro-LED arrays, with integrated control electronics, function as chip-scale digital-to-light converters.
These devices enable sophisticated OWC systems, including tracking, imaging, and space-division multiple access.
The high-speed and controlled nature of micro-LED arrays unlocks complex functionalities for next-generation lighting and communication.