Picture of virus under microscope

Research under the microscope...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

Explore SIPBS research

Investigation of phase-separated electronic states in 1.5 mu m GaInNAs/GaAs heterostructures by optical spectroscopy

Sun, H D and Clark, A H and Calvez, S and Dawson, M D and Gilet, P and Grenouillet, L and Million, A (2005) Investigation of phase-separated electronic states in 1.5 mu m GaInNAs/GaAs heterostructures by optical spectroscopy. Journal of Applied Physics, 97 (3). -. ISSN 0021-8979

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

We report on the comparative electronic state characteristics of particular GaInNAs/GaAs quantum well structures that emit near 1.3 and 1.5 mum wavelength at room temperature. While the electronic structure of the 1.3 mum sample is consistent with a standard quantum well, the 1.5 mum sample demonstrate quite different characteristics. By using photoluminescence (PL) excitation spectroscopy at various detection wavelengths, we demonstrate that the macroscopic electronic states in the 1.5 mum structures originate from phase-separated quantum dots instead of quantum wells. PL measurements with spectrally selective excitation provide further evidence for the existence of composition-separated phases. The evidence is consistent with phase segregation during the growth leading to two phases, one with high In and N content which accounts for the efficient low energy 1.5 mum emission, and the other one having lower In and N content which contributes metastable states and only emits under excitation in a particular wavelength range. (C) 2005 American Institute of Physics.