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Correlation between the structural and optical properties of Mn-doped ZnO nanoparticles

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Title: Correlation between the structural and optical properties of Mn-doped ZnO nanoparticles
Authors: Ton-That, Cuong1 Cuong.Ton-That@uts.edu.au, Foley, Matthew1, Phillips, Matthew R.1, Tsuzuki, Takuya2, Smith, Zoe2
Source: Journal of Alloys & Compounds. May2012, Vol. 522, p114-117. 4p.
Subjects: Optical properties of metals, Nanoparticles, Zinc oxide, Semiconductor doping, Statistical correlation, Crystallography, Manganese compounds
Abstract: Abstract: The crystallographic and optical properties of Mn-doped ZnO nanoparticles prepared by a sol–gel process have been investigated by X-ray diffraction, UV-visible absorption spectroscopy and cathodoluminescence microanalysis. X-ray diffraction reveals that the nanoparticles have hexagonal wurtzite crystal structure, with the lattice constants along the a- and c-axes increasing with increasing Mn concentration from 0 to 2.4at%. For all Mn concentrations in this range, the nanoparticles are essentially free of native point defects so that they exhibit only band-edge luminescence. The optical bandgap and band-edge emission energies for Mn-doped ZnO were found to increase in proportion to the lattice constants. The direct correlation between the bandgap and crystal structure suggests that the band-edge optical properties of Mn-doped ZnO is predominantly influenced by the amount of Mn atoms substituting Zn on the lattice sites. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: The crystallographic and optical properties of Mn-doped ZnO nanoparticles prepared by a sol–gel process have been investigated by X-ray diffraction, UV-visible absorption spectroscopy and cathodoluminescence microanalysis. X-ray diffraction reveals that the nanoparticles have hexagonal wurtzite crystal structure, with the lattice constants along the a- and c-axes increasing with increasing Mn concentration from 0 to 2.4at%. For all Mn concentrations in this range, the nanoparticles are essentially free of native point defects so that they exhibit only band-edge luminescence. The optical bandgap and band-edge emission energies for Mn-doped ZnO were found to increase in proportion to the lattice constants. The direct correlation between the bandgap and crystal structure suggests that the band-edge optical properties of Mn-doped ZnO is predominantly influenced by the amount of Mn atoms substituting Zn on the lattice sites. [Copyright &y& Elsevier]
ISSN:09258388
DOI:10.1016/j.jallcom.2012.01.116