Light sources for wavelengths > 2 µm grown by MBE on InP using a strain relaxed buffer

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Light sources for wavelengths > 2 µm grown by MBE on InP using a strain relaxed buffer

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Light emitting diodes (LEDs) and lasers operating in the 2 to 3 µm spectral region at room temperature are been demonstrated. The devices were fabricated from InxGa1-xAs/InAsyP1-y double heterostructures grown on n-type InP (100) substrates by molecular beam epitaxy. A strain relaxed buffer layer which incorporates composition reversals was used to reduce the threading dislocation density and to accommodate the large lattice mismatch (up to 2.7%) between the InP substrate and the device active region. Efficient electroluminescence emission at wavelengths between 2 and 3 µm was obtained from the LEDs at room temperature, while diode lasers exhibited coherent emission in the range 2–2.6 µm at temperatures up to 130 K. For one of the LEDs a characteristic absorption was readily observed at 2.7 µm in the diode electroluminescence emission spectrum, corresponding to strong water vapour absorption in the atmosphere. These devices could easily form the key component of an infrared gas sensor for water vapour detection and monitoring at 2.7 µm in a variety of different applications.

Inspec keywords: light emitting diodes; gallium arsenide; infrared sources; electroluminescence; laser transitions; measurement by laser beam; semiconductor lasers; monitoring; molecular beam epitaxial growth; indium compounds; gas sensors; III-V semiconductors

Other keywords: water vapour detection; MBE growth; InP substrate; semiconductor lasers; InxGa1-xAs/InAsyP1-y double heterostructures; InP; coherent emission; LEDs; active region; diode electroluminescence emission spectrum; infrared gas sensor; large lattice mismatch; molecular beam epitaxy; strain relaxed buffer layer; light emitting diodes; InGaAs-InAsP; n-type InP (100) substrates; 2 to 3 mum; characteristic absorption; threading dislocation density; monitoring; composition reversals; room temperature; strain relaxed buffer; diode lasers; strong water vapour absorption; light sources; efficient electroluminescence emission; 2.7 mum

Subjects: Chemical sensors; Lasing action in semiconductors; Semiconductor lasers; Chemical sensors; Design of specific laser systems; Optical sources and standards; Vacuum deposition; Metrological applications of lasers; Light emitting diodes; Metrological applications of lasers; Vacuum deposition; Electroluminescence (condensed matter)

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