Well-crystallized Mg xZn 1-xO films were deposited on quartz substrates by sol-gel technique with a variation of x value from 0 to 0.15. The samples were annealed at different temperatures (500°C to 700°C) in air and oxygen atmosphere to study the effect of annealing atmosphere on the luminescence properties of the films. The optical, microstructural and photoluminescence properties of the films were studied. It was found that the band gap of the films increased with increasing Mg concentration (x value). A remarkable change in the photoluminescence spectra of the films for x = 0.05 was observed by varying the annealing atmosphere. Highly intense UV emission at room temperature could be obtained by annealing the Mg 0.05Zn 0.95O film in static oxygen atmosphere, while the intensity of the visible defect related luminescence could be reduced, resulting in a high intensity ratio (∼100) of the two.
|Number of pages||8|
|Journal||Physica Status Solidi (A) Applications and Materials Science|
|Publication status||Published - 1 Feb 2005|