Organic co-decomposition method for the synthesis of Mn and Co doped ZnO submicrometer crystals: Photoluminescence and magnetic properties

✍ Scribed by Wang, H. B. ;Wang, H. ;Wang, X. N. ;Zhang, J. ;Wu, S. ;Duan, J. X. ;Jiang, Y.

• Book ID: 105366339
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 498 KB
• Volume: 208
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.201026737

✦ Synopsis

Abstract

We report on the optical and magnetic characteristics of the Co and Mn doped ZnO submicrometer crystals (SMCs) synthesised by organic thermal decomposition method. The doped ZnO SMCs are hexagon cone in shape with size ranging from 100 to 400 nm. X‐ray diffraction, transmission electron microscopy, and X‐ray photoelectron spectroscopy measurements indicate that the Mn^2+^ and Co^2+^ are doped into the ZnO lattice with concentration of 5.4 and 4.85%, respectively. Optical absorption spectra of the doped SMCs display additional peaks associated with d–d crystal‐field transitions due to the presence of tetrahedral Co^2+^ or Mn^2+^ ions. Photoluminescence of the samples shows suppressed band‐gap emission, indicating that the Mn or Co ions in the ZnO lattice increase the non‐irradiative recombination processes. Magnetic property measurements reveal that the Mn:ZnO SMCs are paramagnetic while the Co:ZnO exhibit weak ferromagnetism at 300 K.