Two-photon absorption induced photoluminescence in para-sexiphenyl nano-needles

被引：3
作者：
Liu, Kang-Jun
Hernandez-Sosa, G.
Sitter, H.
Zhang, Chun-Feng
Dong, Zhi-Wei
Yan, Yong-Li
Qian, Shi-Xiong [1 ]
机构：
[1] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
[2] Fudan Univ, Surface Phys Lab, Shanghai 200433, Peoples R China
[3] Univ Linz, Inst Semicond & Solid State Phys, A-4040 Linz, Austria
来源：
CHEMICAL PHYSICS LETTERS | 2007年 / 446卷 / 1-3期
基金：
奥地利科学基金会; 中国国家自然科学基金;
关键词：
D O I：
10.1016/j.cplett.2007.07.108
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We studied the photoluminescence (PL) properties of self-organized para-sexiphenyl (PSP) nano-needles with linear and nonlinear optical excitation. Excited by femtosecond pulses, two-photon absorption (TPA) induced PL emission peaks corresponding to the vibronic transitions in PSP molecules were observed. Polarization-dependent photoluminescence measurements reveal that the TPA induced PL in the highly-ordered structures, similar with the linear excitation case, is strongly dependent on the excitation polarization. The mechanism that the nonlinear transition dipole moment is oriented parallel to the long axis of the molecular for the pi-pi* absorption in PSP is suggested to explain these strong polarization effects. (C) 2007 Elsevier B.V. All rights reserved.
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页码：83 / 86
页数：4
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