Blue-green Luminescence Of Ce-doped ZnO Thin Films | 42068
Journal of Lasers, Optics & Photonics
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Electronic, structural and photoluminescence properties of ZnO and Ce-doped ZnO thin films deposited on glass substrates by RF
reactive-magnetron sputtering, and post annealed at 300oC into an oxygen atmosphere, were investigated using X-ray diffraction
(XRD), UV-Visible spectroscopy, XPS and PL measurements. Both films crystalized in wurzite structure with lattice parameters
very similar in value to the stress-free standard. Transmittance of both films was high, of about 90% at the visible wavelength region
(~400-750 nm), with a band gap of Eg=3.23 eV and Eg=3.27 eV for pure and Ce-doped films respectively. The absorption edge of the
doped film was shifted to the blue because of the Burstein-Moss effect. XPS spectra showed the coexistence of Ce3+ and Ce4+ ions in
a proportion of about 70%:30% into the host ZnO lattice. Both type of ions induce extra electron states that allows multi-emission
peaks at the blue-green region. Rearrangement of electronic levels because of added Ce into the ZnO matrix is discussed. Such films
with blue-green luminescent properties are promising materials for potential applications in optoelectronic devices.
Manuel García-Méndez got his PhD at the CICESE-UNAM program in Ensenada, México in 2000. Then, he completed a Post-doc in the Physics Department, University of Manchester during 2000-2001. From 2001, he is working as a Titular Researcher at the CICFIM in Monterrey, N.L. México, where he heads the Thin Film Laboratory.