On-chip 3D confocal optical study of an InGaN/GaN microrod LED

Johanna Meier; Julius Kahl; Adrian Avramescu; Martin Strassburg; Gerd Bacher

doi:10.1117/12.2608532

7 March 2022 On-chip 3D confocal optical study of an InGaN/GaN microrod LED

Johanna Meier, Julius Kahl, Adrian Avramescu, Martin Strassburg, Gerd Bacher

Proceedings Volume PC12022, Light-Emitting Devices, Materials, and Applications XXVI; PC120220W (2022) https://doi.org/10.1117/12.2608532
Event: SPIE OPTO, 2022, San Francisco, California, United States

Conference Poster

Abstract

InGaN/GaN core-shell microrods (µrods) are highly promising for a new generation of light-emitting diodes. We present a 3D confocal optical approach with a spatial resolution <500 nm for characterizing operating µrod devices. 3D photoluminescence maps reveal an inhomogeneous emission: red luminescence originates from the apex and green emission from the corners, while blue emission dominates at the sidewalls. A pronounced photocurrent is measured while exciting µrods in closed current configuration, indicating charge carrier losses out of the active region due to tunneling. This interpretation is confirmed by applying an external voltage, where losses are suppressed.

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Johanna Meier, Julius Kahl, Adrian Avramescu, Martin Strassburg, and Gerd Bacher "On-chip 3D confocal optical study of an InGaN/GaN microrod LED", Proc. SPIE PC12022, Light-Emitting Devices, Materials, and Applications XXVI, PC120220W (7 March 2022); https://doi.org/10.1117/12.2608532

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