Abstract
Photoluminescence spectra of a single quantum well with growth islands are investigated in the Stokes as well as in the anti-Stokes regime. While at 5 K only luminescence at energies below the excitation energy can be detected, above 20 K also anti-Stokes luminescence is observed. A rate-equation model reproduces the observed dependence of the intensities of Stokes and anti-Stokes luminescence on temperature and, qualitatively, on the areal density of the growth islands and the properties of the diffusion-assisted transfer between them. The geometrical properties can enhance the anti-Stokes luminescence by almost one order of magnitude.
- Received 23 September 1997
DOI:https://doi.org/10.1103/PhysRevB.56.R15553
©1997 American Physical Society