Ahmed S. Razeen
Cairo University, Egypt
Title: Effect of Ag-doping on the properties of ZnO thin films for UV stimulated emission
Biography
Biography: Ahmed S. Razeen
Abstract
Ag doped ZnO thin films has been prepared using sol-gel spin coating method, with different doping concentrations. Structural and morphological properties of the films have been investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Thin films have been optically pumped and stimulated emission has been observed with strong peaks in the UV region. The UV stimulated emission is found to be due to exciton-exciton scattering, and Ag doping promoted this process by increasing the excitons concentrations in the ZnO lattice. Output-input intensity relation and peak emission, FWHM, and quantum efficiency relations with pump intensity have been reported. The threshold for which stimulated emission started has been evaluated to be about 18 MW/cm2 with quantum efficiency of about 58.7%. The role of Ag in enhancement of stimulated emission from ZnO thin films has been investigated.
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Recent Publications:
- Ahmed S. Razeen, A.-S. Gadallah, and M. M. El-Nahass, “Ultraviolet Stimulated Emission from Sol-Gel Spin Coated ZnO Thin Films,” Advances in Materials Science and Engineering, vol. 2017, Article ID 9464862, 7 pages, 2017. doi:10.1155/2017/9464862.