镁离子掺杂多孔硅的蓝光发射

用电化学方法对多孔硅薄膜进行了镁离子的化学掺杂.用荧光分光光度计分析了样品的光致发光特性,发现镁掺杂增强了多孔硅的蓝光发射,当镁离子浓度增大到0.002mol/L时,可使蓝光强度达到多孔硅红光强度的一半.红外吸收谱表明,掺镁多孔硅的表面形成较完整的Si-O-Si网络结构,分析结果认为,多孔硅的蓝光光激发主要发生在多孔硅的纳米硅粒中,光发射主要发生在多孔硅中包裹纳米硅SiOx层中的发光中心上,对实验结果进行了合理的解释.

Blue Photoluminescence from Magnesium-doped Porous Silicon

Magnesium ions were embedded into porous silicon films by electrochemical method.Scanning probe microscope was used to characterize the surface morphology of films.Fluorescence photo-spectrometer was used to research the photoluminescence properties of the samples.The blue emission of porous silicon was enhanced as magnesium ions' doping.When the concentration of magnesium ions increased to 0.002mol/L,the intensity of the blue light approached half of the red light intensity of the porous silicon without doping.The FTIR showed that the surface of magnesium-doped porous silicon have formed a goodish integrated cross-linked Si-O-Si network.It is concluded that the blue light excitation mainly occurred inside the silicon nanoparticles in porous silicon;however,the emission occurred in the luminescence centers in SiOx layers covering silicon nanoparticles.The experimental results have been explained reasonably.