.Van Hove singularities and nonlinear photoluminescence in multiwalled carbon nanotubes[J].Optoelectronics Letters,2006,2(3):186-188 |
Van Hove singularities and nonlinear photoluminescence in multiwalled carbon nanotubes |
YUAN Yan-hong MIAO Run-cai LIU Bao-ying |
[1]Institute of Photonics & Photon-technology, and Provincial Key Laboratory of Photoelectronic Technology ,Northwest University, Xi'an 710069, China [2]Shanxi Normal University, Xi'an 710062, P.R. China |
Abstract: |
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. |
Hits: 3742 |
Download times: 179 |
|
View Full Text Download reader |