EFFICIENT INFRARED-UP-CONVERSION LUMINESCENCE IN POROUS SILICON - A QUANTUM-CONFINEMENT-INDUCED EFFECT

被引:74
作者
WANG, J [1 ]
JIANG, HB [1 ]
WANG, WC [1 ]
ZHENG, JB [1 ]
ZHANG, FL [1 ]
HAO, PH [1 ]
HOU, XY [1 ]
WANG, X [1 ]
机构
[1] FUDAN UNIV,SURFACE PHYS LAB,SHANGHAI,PEOPLES R CHINA
关键词
D O I
10.1103/PhysRevLett.69.3252
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We demonstrate for the first time that a porous silicon layer (PSL), which has a bright light-emission band in the range of 500-700 nm, exhibits a strong visible-range luminescence under the illumination of an infrared ultrashort pulsed laser. The dependence of integrated luminescence intensity on pump power shows that this is a third-order nonlinear optical effect. By comparing with UV-light-excited spectra of PSL and samples with low porosity which have inefficient luminescence, a possible explanation is proposed whereby the large nonlinear optical response is due to the quantum confinement effect.
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页码:3252 / 3255
页数:4
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