Van Hove singularities and nonlinear photoluminescence in multiwalled carbon nanotubes

被引：0
|
作者：
Yuan Yan-hong [1 ,2 ]
Miao Run-cai [3 ]
Liu Bao-ying [1 ,2 ]
机构：
[1] Northwest Univ, Inst Photon & Photon Technol, Xian 710069, Shaanxi, Peoples R China
[2] Northwest Univ, Prov Key Lab Photoelect Technol, Xian 710069, Shaanxi, Peoples R China
[3] Shaanxi Normal Univ, Xian 710062, Shaanxi, Peoples R China
来源：
OPTOELECTRONICS LETTERS | 2006年 / 2卷 / 03期
关键词：
D O I：
暂无
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The absorption spectrum and photoluminescence spectrum of multiwalled carbon nanotubes(MWNTs) and the peaks related with Van Hove singularities(VHS) were obtained experimentally. Both the VHS formation and the change of band gaps in MWNTs depend on the intershell interaction. The VHS makes the probability of optical transitions enhanced, but the intershell interaction suppresses such radiative transitions. The excitation in the experiment involves a two-photon absorption process and the emission light has the effect of the optical frequency up-conversion.
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页码：186 / 188
页数：3
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