NDIR gas sensing using high performance AlInSb mid-infrared LEDs as light source

E. G. Camargo; Y. Goda; O. Morohara; H. Fujita; H. Geka; K. Ueno; Y. Shibata; N. Kuze

doi:10.1117/12.2272905

30 August 2017 NDIR gas sensing using high performance AlInSb mid-infrared LEDs as light source

E. G. Camargo, Y. Goda, O. Morohara, H. Fujita, H. Geka, K. Ueno, Y. Shibata, N. Kuze

Proceedings Volume 10404, Infrared Sensors, Devices, and Applications VII; 104040R (2017) https://doi.org/10.1117/12.2272905
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

In this paper, we report the performance of room temperature operated mid-infrared light emitting diode (LED) with an InSb buffer layer and AlInSb active/barrier layers, which showed to be suitable for non-dispersive infrared (NDIR) gas sensing. Characterization of the LED was performed and we found that good carrier confinement and crystalline quality was responsible for its high performance. High efficiency light extraction was obtained by adopting backside emission architecture together with surface roughening treatment and TiO₂ anti-reflection coating. The fabricated AlInSb LED showed 75% higher power conversion efficiency when compared with a commercially available device. The developed LED, together with a commercially available infrared (IR) detector equipped with band-pass optical filter (AK9710, manufactured by Asahi Kasei Microdevices) were coupled into a mirror system forming a light path length of 80 mm, which was tested for CO₂ gas sensing. For a non-absorbing environment, sensor output of 8 nA was obtained by driving the LED with peak current of 100 mA and, by exposing the system at CO₂ concentration of 1000 ppm signal reduction due to absorbance around 12% was obtained.

Conference Presentation

Citation Download Citation

E. G. Camargo, Y. Goda, O. Morohara, H. Fujita, H. Geka, K. Ueno, Y. Shibata, and N. Kuze "NDIR gas sensing using high performance AlInSb mid-infrared LEDs as light source", Proc. SPIE 10404, Infrared Sensors, Devices, and Applications VII, 104040R (30 August 2017); https://doi.org/10.1117/12.2272905

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