摘要
ZnO nanorods prepared by a solution-phase method are annealed at different temperatures in oxygen ambient.The luminescence properties of the samples are investigated.In the same excitation condition,the photoluminescence(PL) spectra of all samples show an ultraviolet(UV) emission and a broad strong visible emission band.The asymmetric visible emis-sion band of annealed samples has a red-shift as the annealing temperature increasing from 200 ℃ to 600 ℃ and it can be deconvoluted into two subband emissions centered at 535 nm(green emission) and 611 nm(orange-red emission) by Gaussian-fitting analysis.Analyses of PL excitation(PLE) spectra and PL spectra at different excitation wavelengths reveal that the green emission and the orange-red emission have a uniform initial state,which can be attributed to the electron transition from Zn interstitial(Zni) to oxygen vacancy(Vo) and oxygen interstitial(Oi),respectively.
ZnO nanorods prepared by a solution-phase method are annealed at different temperatures in oxygen ambient. The luminescence properties of the samples are investigated. In the same excitation condition, the photoluminescence （PL） spectra of all samples show an ultraviolet （UV） emission and a broad strong visible emission band. The asymmetric visible emission band of annealed samples has a red-shift as the annealing temperature increasing from 200 ℃ to 600℃ and it can be deconvoluted into two subband emissions centered at 535 nm （green emission） and 611 nm （orange-red emission） by Gaussian-fitting analysis. Analyses of PL excitation （PLE） spectra and PL spectra at different excitation wavelengths reveal that the green emission and the orange-red emission have a uniform initial state, which can be attributed to the electron transition from Zn interstitial （Zni） to oxygen vacancy （Vo） and oxygen interstitial （Oi）, respectively.
基金
supported by the National Natural Science Foundation of China(Nos.60877029,10904109,60977035 and 60907021)
the Natural Science Foundation of Tianjin(Nos.09JCYBJC01400 and 10SYSYJC28100)
the Key Subject for Materials Physics and Chemistry of Tianjin
the Open Foundation of Key Laboratory of Luminescence and Optical Information of Ministry of Education(Nos.2010LOI02 and 2010LOI11)
