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14 May 2019 Quantum interband cascade superlattice light-emitting diodes for environmental and health sensing (Conference Presentation)
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Abstract
The QuiC SLED light emitting diode and its photodiode counterpart, the PDQ, use InAs-GaSb p-i-n superlattices for emission and detection, cascaded with tunnel junctions. Variable-period superlattices form the carrier injectors and separate-confinement heterostructures. The superlattices mitigate Auger recombination losses; weakly-coupled dielectric buttes enhance light extraction, and composite metal-mesh electrodes aid current spreading. The first example of the platform, emitting at 4.25 µm and aligned with carbon dioxide absorption in the MWIR band, is rated at 2 mW in pulse mode at room temperature. Emitting superlattices can cover approximately 3 µm to 12 µm wavelengths. Prominent sensing applications for this class of devices rely on short-pulse, low-duty cycle measurements to reduce system power requirements for long battery life. An important target is for the LEDs typically to consume less than a few microjoules per measurement pulse. Within this context, the optimal QuiC SLED-PDQ properties are defined by the needs of the product stack, which starts with these mid-IR devices and extends through the analog front end chips and signal processing chips, to the application algorithms and user interface.
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Mark S. Miller , Mark S. Miller , and Mark S. Miller "Quantum interband cascade superlattice light-emitting diodes for environmental and health sensing (Conference Presentation)", Proc. SPIE 11007, Advanced Environmental, Chemical, and Biological Sensing Technologies XV, 110070M (14 May 2019); https://doi.org/10.1117/12.2519256
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