Exciton delocalization length of merocyanine J-aggregates in Langmuir-Blodgett films studied from linear and nonlinear absorption measurements

被引：25
|
作者：
Hamanaka, Y [1 ]
Kurasawa, H
Nakamura, A
Uchiyama, Y
Marumoto, K
Kuroda, S
机构：
[1] Nagoya Univ, Grad Sch Engn, Dept Appl Phys, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[2] Nagoya Univ, Ctr Integrated Res Sci & Engn, Nagoya, Aichi 4648603, Japan
[3] Nagoya Univ, Dept Crystalline Mat Sci, Nagoya, Aichi 4648603, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2002年 / 363卷 / 3-4期
关键词：
D O I：
10.1016/S0009-2614(02)01217-4
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：
A delocalization length and dimensionality of Frenkel excitons in 6-methyl merocyanine J-aggregates in Langmuir-Blodgett films have been investigated by means of linear and nonlinear absorption spectroscopy. The absorption spectrum of dye molecules in an LB film shows the energy shift due to the formation of J-aggregates with respect to the transition energy of monomers. From the differential absorption spectra measured by the femtosecond pump and probe experiment, we have obtained exciton energies of the lowest and second lowest states in J-aggregates. Using both spectroscopic data and a dipole model of molecular arrangement, we have determined the exciton delocalization size of two-dimensional J-aggregates (26(+/-1) x 40(+/-9) molecules). (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：233 / 240
页数：8
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