Acta Photonica Sinica, Volume. 34, Issue 11, 1651(2005)
Study on frequency upconverion of multiwalled carbon nanotubes
The absorption and photoluminescence spectrum of MWNTs have been measured. The optical frequency upconversion has been observed from MWNTs. The photoluminescence spectrum,which was observedonexcitationat1064nm,consistedofabroadstructuredband,peakingatapproximately780nm.Van Hove Singularities (VHS) in the density of states of multiwalled carbon nanotubes have been discoveredfromabsorptionspectrum.Thepeaks,correspondingtoVHS,locatedat685nm,719nm,894nm.The mechanism describing the underlying processes shows that the excitation involves double-photon absorption followed by non-radiative vibrational decay to the VHS states. Subsequently, the luminescence is produced by radiative transition.
Get Citation
Copy Citation Text
[in Chinese], [in Chinese], [in Chinese], [in Chinese]. Study on frequency upconverion of multiwalled carbon nanotubes[J]. Acta Photonica Sinica, 2005, 34(11): 1651