Open Access Nano Express

Controlled suppression of the photoluminescence superlinear dependence on excitation density in quantum dots

Sergio Bietti* and Stefano Sanguinetti

Author Affiliations

LNESS and Dipartimento di Scienza dei Materiali, Universitá di Milano-Bicocca, Via Cozzi 53, Milano, I-20125, Italy

For all author emails, please log on.

Nanoscale Research Letters 2012, 7:551  doi:10.1186/1556-276X-7-551

Published: 4 October 2012

Abstract

We have shown that it is possible to tune, up to complete suppression, the photoluminescence superlinear dependence on the excitation density in quantum dot samples at high temperatures by annealing treatments. The effect has been attributed to the reduction of the defectivity of the material induced by annealing.

Keywords:
Quantum dots; Droplet epitaxy; Photoluminescence; Annealing