Journal
THIN SOLID FILMS
Volume 520, Issue 23, Pages 6845-6849Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2012.07.088
Keywords
Chromium doping; Zinc gallium oxide; Thin films; Luminescence; Pulsed laser deposition
Categories
Funding
- National High Technology Development 863 Program of China [2009AA03Z428]
- Fok Ying Tong Education Foundation [111050]
- Shandong Provincial Natural Science Foundation of China [ZR2011FQ001]
- Key Project of Science and Technology of Shandong Province of China [2010GGX10127]
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Chromium-doped zinc gallate powder is synthesized via a solid-state reaction and subsequently deposited as a thin film on quartz substrates by using a pulsed laser deposition technique under two different deposition conditions. The films are characterized with X-ray diffraction, scanning electron microscopy, UV-vis spectro-photometry and luminescent measurements. As the oxygen pressure is changed from 0 to 1 Pa, we find that the grain size gets smaller, the crystallinity improves, the band-gap energy increases, the excitation peaks of the charge transfer band exhibit a remarkable blue-shift from 263 to 247 nm and the intensity of the red emission (694 nm) is enhanced. The results suggest that the structural and luminescent properties of ZnGa2O4:Cr3+ thin film phosphors are improved by deposition at an oxygen pressure of 1 Pa. (C) 2012 Elsevier B.V. All rights reserved.
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