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17 March 2023 Cascaded mid-infrared LEDs in resonant structures
John P. Prineas, David A. Montealegre, Weitao Dai, Katrina N. Schrock, Logan M. Nichols, Matthew Z. Bellus, Alex C. Walhof
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Proceedings Volume PC12430, Quantum Sensing and Nano Electronics and Photonics XIX; PC124300M (2023) https://doi.org/10.1117/12.2655279
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
As the efficiency of mid-infrared LEDs has advanced, they have assumed increasing importance in sensitive gas optical sensors, most prominently for methane and carbon, and LED arrays for defense-related projection systems. While cascading and superlattice quantum design has advanced efficiency, a key limiting mechanism in these devices is heavy loss from total internal reflection due to the very high index of refraction (~3.8). Here we report on the substantial enhancement of spectral radiance in one- and two-color LED emitters using a microcavity approach, and enhancement in overall radiance of single color emitters using micropillar structured devices.
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John P. Prineas, David A. Montealegre, Weitao Dai, Katrina N. Schrock, Logan M. Nichols, Matthew Z. Bellus, and Alex C. Walhof "Cascaded mid-infrared LEDs in resonant structures", Proc. SPIE PC12430, Quantum Sensing and Nano Electronics and Photonics XIX, PC124300M (17 March 2023); https://doi.org/10.1117/12.2655279
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KEYWORDS
Light emitting diodes
Mid-IR
Optical microcavities
Quantum efficiency
Methane
Molecular beam epitaxy
Optical sensors
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