Abstract
We report the first observations of electroluminescence (EL) and lasing in laser structures with high Al-content (x=0.64, Eg=1.474 eV) cladding layers and a narrow-gap InGaAsSb active layer (Eg=0.326 eV at T=77K). The structures are LPE-grown lattice-matched to GaSb substrate. Band energy diagrams of the laser structures had strongly asymmetric band offsets. The heterojunction between high Al-content layer and InGaAsSb narrow-gap active layer has a type II broken-gap alignment at 300K. In this laser structure spontaneous emission was obtained at 7n=3.8fum at T=77K and 7n=4.25 fum at T=300K. Full width at half maximum (FWHM) of emission band was 34 meV. Emission intensity decreased by a factor of 30 from T=77K to 300K. Lasing with single dominant mode was achieved at 7n=3.774 fum (T=80K) in pulsed mode. Threshold current as low as 60 mA and characteristic temperature T0=26K were obtained at T=80-120K.
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Acknowledgement
Authors thank Prof.G.Zegrya for the valuable discussion. This work was supported in part by the Russian project #1-074 “Solid-State nanostructures physics” and RBRF project # 96-0217841a.
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Mikhailova, M.P., Zhurtanov, B.E., Moiseev, K.D. et al. 3.2 AND 3.8 fum Emission and Lasing in AlGaAsSb/InGaAsSb Double Heterostructures with Asymmetric Band Offset Confinements. MRS Online Proceedings Library 484, 101–106 (1997). https://doi.org/10.1557/PROC-484-101
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DOI: https://doi.org/10.1557/PROC-484-101