XRD, photoluminescence and optical absorption investigations of cobalt-doped ZnO
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Publication Details
Author list: Sujinnapram S., Onreabroy W., Nantawisarakul T.
Publisher: American Institute of Physics
Publication year: 2009
Volume number: 1150
Start page: 340
End page: 343
Number of pages: 4
ISBN: 9780735406872
ISSN: 0094-243X
eISSN: 1551-7616
Languages: English-Great Britain (EN-GB)
Abstract
Zn1-xCoxO (with x = 0, 0.01, 0.10 and 0.20) were synthesized by solid-state reaction method sintered at 600 ฐC for 12 hours. The samples were studied by X-ray diffraction (XRD), optical absorption (UV-Vis) and Photoluminescence (PL). Structural analysis by Rietveld method using XRD showed that the peaks of secondary phase Co3O4 with a cubic structure were visible in the high-doped sample (x = 0.1, 0.2), besides the main peaks of wurtzite-like structure the same as that of ZnO. Shift of the XRD peaks proved the incorporation of Co2+ into the ZnO lattice. The band gap energy decreased from 3.18 to 3.14 eV with the increasing of cobalt concentration. PL spectra at room temperature showed the blue emission with the peak around 412 nm. In addition, the intensity of the blue emission decreased upon increasing the Co concentration, which indicated their high structural, defects and optical quality in the ZnO. ฉ 2009 American Institute of Physics.
Keywords
Co-doped ZnO, DMS
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