High efficiency mid-infrared interband cascade LEDs grown on low absorbing substrates emitting > 5 mW of output power
MetadataShow full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
We present interband cascade light-emitting devices with incoherent and broadband light emission peaked at a wavelength of around 3.7 μm. The substrate-side-emitting devices display higher wall plug efficiencies and maximum output powers than any earlier mid-infrared LEDs operating in continuous wave at room temperature. To reduce absorption losses, the epitaxial structures were grown on low doped (low absorbing) GaSb substrates. The nine active stages were positioned in different configurations to investigate the impact of constructive or destructive interference when reflected from the epitaxial-side metallization of the flip-chip mounted devices. A comparison shows improved electrical properties and outcoupling efficiencies when all active stages are centered within a single antinode of the optical field. The optimized voltage efficiency combined with low optical losses lead to a maximum wall plug efficiency of 0.7%. Flip-chip mounted devices with a 640-μm squared mesa reached output powers of up to 5.1 mW at ambient temperatures with driving current (voltage) of 0.6 A (5.1 V).
Schäfer , N , Scheuermann , J , Weih , R , Koeth , J & Höfling , S 2019 , ' High efficiency mid-infrared interband cascade LEDs grown on low absorbing substrates emitting > 5 mW of output power ' , Optical Engineering , vol. 58 , no. 11 , 117106 . https://doi.org/10.1117/1.OE.58.11.117106
Copyright © 2019 SPIE. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1117/1.OE.58.11.117106
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.