Multispectral mid-infrared light emitting diodes on a GaAs substrate

Aziz, M., Xie, C., Pusino, V. , Khalid, A. , Steer, M., Thayne, I. G. and Cumming, D. R.S. (2017) Multispectral mid-infrared light emitting diodes on a GaAs substrate. Applied Physics Letters, 111(10), 102102. (doi: 10.1063/1.4986396)

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We have designed, simulated, and experimentally demonstrated four-colour mid-infrared (mid-IR) Light Emitting Diodes (LEDs) integrated monolithically into a vertical structure on a semi-insulating GaAs substrate. In order to finely control the peak wavelength of the emitted mid-IR light, quantum well (QW) structures based on AlInSb/InSb/AlInSb are employed. The completed device structure consists of three p-QW-n diodes with different well widths stacked on top of one bulk AlInSb p-i-n diode. The epitaxial layers comprising the device are designed in such a way that one contact layer is shared between two LEDs. The design of the heterostructure realising the multispectral LEDs was aided by numerical modelling, and good agreement is observed between the simulated and experimental results. Electro-Luminescence measurements, carried out at room temperature, confirm that the emission of each LED peaks at a different wavelength. Peak wavelengths of 3.40 μm, 3.50 μm, 3.95 μm, and 4.18 μm are observed in the bulk, 2 nm, 4 nm, and 6 nm quantum well LEDs, respectively. Under zero bias, Fourier Transform Infrared photo-response measurements indicate that these fabricated diodes can also be operated as mid-IR photodetectors with an extended cut-off wavelength up to 4.6 μm.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Thayne, Prof Iain and Xie, Mr Chengzhi and Cumming, Professor David and Pusino, Mr Vincenzo and Khalid, Dr Ata-Ul-Habib and Aziz, Dr Mohsin and Steer, Dr Matthew
Authors: Aziz, M., Xie, C., Pusino, V., Khalid, A., Steer, M., Thayne, I. G., and Cumming, D. R.S.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
Publisher:AIP Publishing
ISSN (Online):1077-3118
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Applied Physics Letters 111(10):102102
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
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6672319UK Quantum Technology Hub in Enhanced Quantum ImagingMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)EP/M01326X/1S&E P&A - PHYSICS & ASTRONOMY