AlInSb Mid‐Infrared LEDs of High Luminous Efficiency for Gas Sensors

In this paper, performance of mid‐infrared light emitting diodes (LEDs) with an InSb buffer layer and AlInSb active/barrier layers, emitting at room temperature is reported. This film structure makes an ideal base material in view of carrier confinement and crystalline quality. In order to achieve a...

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Bibliographic Details
Published in:Physica status solidi. A, Applications and materials science Applications and materials science, 2018-04, Vol.215 (8), p.n/a
Main Authors: Fujita, Hiromi, Ueno, Koichiro, Morohara, Osamu, Camargo, Edson, Geka, Hirotaka, Shibata, Yoshihiko, Kuze, Naohiro
Format: Article
Language:English
Subjects:
AlInSb
Barrier layers
Buffer layers
Conversion coating
Efficiency
Energy conversion efficiency
Gas sensors
Infrared radiation
Light emitting diodes
mid‐infrared light emitting diodes
Organic light emitting diodes
Titanium dioxide
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Summary:In this paper, performance of mid‐infrared light emitting diodes (LEDs) with an InSb buffer layer and AlInSb active/barrier layers, emitting at room temperature is reported. This film structure makes an ideal base material in view of carrier confinement and crystalline quality. In order to achieve a high efficiency for light extraction, backside emission architecture is adopted together with a rough emitting surface and TiO2 anti‐reflection coating. The resulting AlInSb LED shows 75% higher power conversion efficiency than the reference, which has the highest efficiency in the market to date. AlInSb mid‐infrared light emitting diode (LED) in a plastic‐mold package is fabricated, which shows 75% higher power conversion efficiency than the highest performance LED in the market. This highly efficient structure is achieved by the adoption of AlInSb/InSb double buffer layer and AlInSb/AlInSb carrier confinement layers, as well as back‐side emission architecture. In addition, roughening and TiO2 anti‐reflection coating processes are applied to the emitting surface.
ISSN:1862-6300
1862-6319
DOI:10.1002/pssa.201700449