光谱学与光谱分析
激发波长对多孔硅荧光特性的影响
黄远明,周甫方
汕头大学应用物理系, 广东 汕头 515063
Excitation-Wavelength Dependent Photoluminescence from Porous Silicon
HUANG Yuan-ming, ZHOU Fu-fang
Department of Applied Physics, Shantou University, Shantou 515063, China
摘要 ： 用荧光光谱仪测量了多孔硅样品的任一给定点的荧光特性与激发波长的依赖关系, 发现当激发波长从650 nm变到340 nm时，该点的荧光谱峰位从780 nm连续蓝移到490 nm。用扫描电子显微镜(SEM)对多孔硅的截面进行了分析，结果显示多孔硅具有分形特性，这同作者的计算机模拟结果一致。结合多孔硅样品的激发光谱测量结果，多孔硅的荧光特性随激发波长改变的现象可以归因于多孔硅的分形结构以及量子尺寸效应。
关键词 ：多孔硅;分形结构;量子尺寸效应
Abstract ：With the technique of fluorescence spectral analysis, the dependence of the fluorescence from porous silicon on the excitation wavelength was investigated. It was found when the excitation wavelength decreases from 650 to 340 nm, the fluorescence spectrum of porous silicon blue shifts continuously from 780 to 490 nm. Using scanning electron microscopy (SEM) and computer simulation, the cross-sectional structures of porous silicon were studied. The authors’ results showed that the microstructures of porous silicon exhibit fractal characteristics. With the additional information extracted from the excitation spectra of porous silicon, the authors’ results can be interpreted in terms of the quantum size effect and the fractal structures of porous silicon.
Key words ：Porous silicon;Fractal structure;Quantum size effect
收稿日期: 2005-11-25
修订日期: 2006-06-22
通讯作者:
黄远明
E-mail: Huangym@stu.edu.cn
引用本文:
黄远明,周甫方. 激发波长对多孔硅荧光特性的影响[J]. 光谱学与光谱分析, 2007, 27(04): 762-764.
链接本文:
https://www.gpxygpfx.com/CN/Y2007/V27/I04/762
[1] Canham L T. Appl. Phys. Lett., 1990, 57(10): 1046.
