%0 Journal Article
%T Study on frequency upconverion of multiwalled carbon nanotubes<br>多壁纳米碳管的频率上转换效应研究
%A Yuan Yanhong
%A Miao Runcai
%A Bai Jintao
%A Hou Xun
%A <br>袁艳红
%A 苗润才
%A 白晋涛
%A 侯洵
%J 光子学报
%D 2005
%I 
%X 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.
%K Carbon nanotube
%K Van Hove Singularity
%K Frequency upconversion<br>碳纳米管
%K 范霍夫奇点
%K 频率上转换
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=9F6139E34DAA109F9C104697BF49FC39&aid=E89166C29B8F531B&yid=2DD7160C83D0ACED&vid=339D79302DF62549&iid=708DD6B15D2464E8&sid=1CF15D8E59774A81&eid=4C9B788AD3F48EA4&journal_id=1004-4213&journal_name=光子学报&referenced_num=3&reference_num=8