Exciton localization in films of ZnO nanoparticles (original) (raw)

2012

Abstract

ABSTRACT Temperature dependent photoluminescence (PL) spectroscopy has been employed to study the exciton localization in ZnO nanostructures of various sizes. Low temperature (LT) near-band-edge UV emission from ZnO nanostructures of size less than 100 nm show signature of free exciton (FE), bound exciton and longitudinal-optical phonon replica of FE lines. Free and bound excitonic emission deviates from the Varshni equation at LT and exhibits S-shaped temperature dependence due to the exciton localization effect. Deviations of the measured data from the Varshni equation directly provide the exciton localization energies, ELoc. It was found that ELoc increases and dELocalization due to thermal activation occurs at higher temperature for smaller nanoparticles.

Dr. Giri Dhari Patra hasn't uploaded this paper.

Let Dr. Giri Dhari know you want this paper to be uploaded.

Ask for this paper to be uploaded.