【摘要】 采用阳极氧化方法制备了多孔硅(PS),经过超声波充分粉碎PS层得到分散的Si纳米颗粒(n-Si),利用高速离心旋转方法将n-Si镶嵌到多孔氧化铝(Al2O3)模板中,得到n-Si/Al2O3复合体系。研究了PS、分散的n-Si和n-Si/Al2O3的荧光(PL)光谱性质,观察到n-Si极强的蓝紫光发射。结果表明,在Al2O3模板中的n-Si,比起PS和丙酮中的发光峰值波长向短波方向“蓝移”,而且半峰全宽(FWHM)也相对变窄。实验现象表明,量子限制效应(QCE)对样品的PL性质有重要作用,并用QCE对样品的发光“蓝移”现象进行了解释。更多还原

【Abstract】 Samples of porous silicon（PS） are fabricated by anodization with constantly current density,then dispersed into a colloid of Si nanoparticles（n-Si） by using supersonic.We select Al₂O₃ as a template to embed the n-Si with centrifugal force,the complex material of n-Si/Al₂O₃ can be obtained.Photoluminescent（PL） properties of PS,n-Si in acetone and in Al₂O₃ are studied systematically,and a ultrabright blue-purple photoluminescent band of n-Si can be observed.The experimental result of PL shows that there is a rather blueshift for the peak wavelength of n-Si in Al₂O₃ compared with the PS and n-Si in acetone.It has been suggested that the quantum confinement effect（QCE） may be suitably explained for the PL spectra of Al₂O₃ and n-Si.更多还原