Influence of mesoscopic ordering on the photoexcitation transfer dynamics in supramolecular assemblies of oligo-p-phenylenevinylene

被引:29
作者
Chang, MH
Hoeben, FJM
Jonkheijm, P
Schenning, APHJ
Meijer, EW
Silva, C
Herz, LM
机构
[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
[2] Eindhoven Univ Technol, Lab Macromol & Organ Chem, NL-5600 Eindhoven, Netherlands
[3] Univ Montreal, Montreal, PQ H3C 3J7, Canada
基金
英国工程与自然科学研究理事会;
关键词
D O I
10.1016/j.cplett.2005.10.105
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 have investigated the influence of molecular arrangement on the transfer rates of photoexcitations along supramolecular assemblies of hydrogen-bonded oligo-p-phenylenevinylene (OPV) molecules for two different packing geometries. For well-defined, helical stacks of monofunctional OPVs fast (approximate to 50 ps) photoluminescence depolarization and excitation transfer to dopants was observed, in agreement with semi-coherent exciton diffusion. For disordered assemblies of bifunctional OPVs incorporating a spacer to link adjacent molecules, depolarization and energy transfer dynamics occur on a longer time scale (, nanosecond). This strongly suggests that such spacers need to be tuned carefully as they may otherwise interfere with the pi-stacking thereby reducing the intermolecular electronic coupling. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:196 / 201
页数:6
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