Journal article
Color Crosstalk in Two-Color Mid-Infrared LEDs With and Without Cavity Enhancement
IEEE journal of quantum electronics, Vol.61(4), pp.1-8
08/2025
DOI: 10.1109/JQE.2025.3586201
Abstract
Mid-infrared (3-5 μm) LEDs have assumed greater importance optical gas sensors and have been explored for use in midinfrared LED arrays, in both cases to replace thermal pixels. Compared to thermal pixels, mid-infrared LEDs have near instantaneous settling times, achieve higher radiance, can have multi-spectral output, and are safer. Multispectral output creates the possibility of emission into narrowed bands for either sensing multiple gas species or creating dual emission thermal pixel arrays. However, their adoption for these applications is hindered by spectral crosstalk from emission tails at room temperature, and additionally by low efficiency, problematic in dense LED arrays with strict power density requirements. This work explores three approaches to designing two-color mid-infrared LED arrays, targeting reduced spectral crosstalk and lower power requirements: (1) monolithic two-color LEDs, (2) monolithic two-color cavity LEDs, and (3) filtered single-color cavity LEDs combined spatially. Performance metrics, such as power-to-temperature efficiency and radiance-to-crosstalk ratios, are compared across designs. Incorporation of cavities narrows emission, improves spectral radiance by 5-10x and overlap with the emission band, lowers power requirements by ~2-3x, and can reduce crosstalk. In-band to cross-band radiance ratio is generally limited to around 10-1000x for monolithic two-color devices; two single color devices allow external filtering which improves the ratio to 10 5 -10 7 . Results provide a framework for use of mid-infrared LEDs in multi-gas sensing and two-color mid-infrared LED arrays.
Details
- Title: Subtitle
- Color Crosstalk in Two-Color Mid-Infrared LEDs With and Without Cavity Enhancement
- Creators
- D.A. Montealegre - University of IowaW. Dai - University of IowaM.Z. Bellus - University of IowaL.M. Nichols - University of IowaJ.P. Prineas - Photonics
- Resource Type
- Journal article
- Publication Details
- IEEE journal of quantum electronics, Vol.61(4), pp.1-8
- DOI
- 10.1109/JQE.2025.3586201
- ISSN
- 0018-9197
- eISSN
- 1558-1713
- Publisher
- IEEE
- Number of pages
- 1
- Grant note
- W900KK-20-C-0008 / US Department of the Army
- Language
- English
- Electronic publication date
- 07/03/2025
- Date published
- 08/2025
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984845652002771
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