Abstract:
Light-emitting diodes (LEDs) operating in the 4.4–4.8-$\mu$m wavelength range have been developed for detecting the presence of carbon monoxide (CO) in air. The proposed LEDs are based on InAsSbP/InAsSb heterostructures with InAs$_{0.85}$Sb$_{0.15}$ active region, which were grown by metalorganic vapor-phase epitaxy. The electrolumuinescent properties of LEDs have been studied. The output power of LED operating in a pulsed mode reaches 50 $\mu$W at a current pulse amplitude of 2 A, and that in a quasi-continuous wave mode is 1 $\mu$W at a current of 200 mA. The absorption of LED radiation in a gaseous medium containing 10% CO has been studied. The proposed LEDs can be used to simultaneously detect both CO$_2$ (absorbing at $\lambda$ = 4.3 $\mu$m) and CO ($\lambda$ = 4.67 $\mu$m).
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