Native defects affecting the Li atom distribution tune the optical emission of ZnO:Li epitaxial thin film

Abstract

It is found that the oxygen vacancy (V-O) defect concentration affecting the separation between individual species in Li-Zn-Li-i complex influences the optical emission property of Li0.06Zn0.94O epitaxial thin film grown by pulsed laser deposition. The film grown under low oxygen partial pressure (n-type conductivity)/higher partial pressure (resistive-type) has broad emission at similar to 2.99 eV/similar to 2.1 eV and a narrower emission at 3.63 eV/3.56 eV, respectively. First principle based mBJLDA electronic structure calculation suggests that the emission at 2.99 eV is due to the LiZn-Lii pair complex and the emission at 2.1 eV is when the component species are away from each other. (C) 2014 AIP Publishing LLC.