Graphene and AlGaN nanowire hybrids based UV-C LEDs for disinfection applications

Priti Gupta; Amy Wilson Miller

doi:10.1117/12.2609520

5 March 2022 Graphene and AlGaN nanowire hybrids based UV-C LEDs for disinfection applications

Priti Gupta, Amy Wilson Miller

Proceedings Volume 12003, 2D Photonic Materials and Devices V; 1200306 (2022) https://doi.org/10.1117/12.2609520
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

The field of UV-C LEDs based on AlGaN semiconductors is rapidly progressing due to increasing demands for disinfection. Viruses and bacteria are eradicated efficiently and sustainably when exposed to UV-C radiation. The current worldwide pandemic has shed light on the growing need for solutions to prevent both fomite and airborne transmission of pathogenic microbes, and UV-C radiation from LEDs presents a safe and sustained solution for a future beyond the current crisis. Most market leaders are based on thin-film technology that has intrinsic challenges of dislocation densities, heat extraction, and internal polarization, thus leading to limited internal quantum efficiencies. Graphene, with its outstanding properties of high thermal conductivity, high transparency to the light of all wavelengths, combined with a low sheet resistance, promises to solve some of these challenges in AlGaN-based UV-C LEDs. We report the demonstration of graphene as both the substrate and transparent electrode of a functional AlGaN nanowire-based UV-C LED. Graphene, as the substrate and electrical contact for UV-C flip chip LED, also gives the potential to use its high thermal conductivity for efficient heat dissipation. Moreover, in comparison to thin-film UV-C LEDs, our AlGaN-based nanowire array on graphene results in dislocation-free devices with semi-polar orientation, which provides us the ability to achieve high internal quantum efficiency in our LEDs.

Conference Presentation

Citation Download Citation

Priti Gupta and Amy Wilson Miller "Graphene and AlGaN nanowire hybrids based UV-C LEDs for disinfection applications", Proc. SPIE 12003, 2D Photonic Materials and Devices V, 1200306 (5 March 2022); https://doi.org/10.1117/12.2609520

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