Abstract
nanoparticles embedded in thin films were prepared by a simple coevaporation method, and the subsequent thermal annealing in oxygen ambient at . X-ray diffraction and optical absorption spectra revealed that the size of nanoparticles embedded in decreased with increasing annealing temperature, and interlayers were formed between nanoparticles and matrix. Analysis of Raman scattering spectra showed that the strain originated from lattice mismatch between and was relaxed by annealing processes, and the alloy layers between nanoparticles and matrix were formed. In photoluminescence spectra, the exciton emissions of nanoparticles shift to shorter wavelengths with increasing annealing temperature. When the annealing temperatures exceeded , a strong emission appeared at , while the deep level emission band in the visible light region was dramatically quenched.
- Received 9 August 2004
DOI:https://doi.org/10.1103/PhysRevB.71.125430
©2005 American Physical Society