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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. 相似文献
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电信互联互通问题一直是政府实施电信管制的焦点和难点.本文作者纵观这些年互联互通问题的实际情况,总结了互联互通问题的三种表现形式,预见性地提出了当前和将要面临的电信业务互联的问题;总结了电信运营商在互联互通问题上的三种利益冲突,提出了在竞争性的市场上,可能出现的企业联盟及其互联互通动机;最后为解决互联互通问题,提出了必须完成的四个关键性的管制任务. 相似文献
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