Influence of mesoscopic ordering on the photoexcitation transfer dynamics in supramolecular assemblies of oligo-p-phenylenevinylene
Influence of mesoscopic ordering on the photoexcitation transfer dynamics in supramolecular assemblies of oligo-p-phenylenevinylene
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DOI：
10.1016/j.cplett.2005.10.105
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发表时间：
2006-01-25
影响因子：
2.8
通讯作者：
Herz, LM
中科院分区：
文献类型：
--
作者：
Chang, MH;Hoeben, FJM;Herz, LM
研究了两种不同几何构型的氢键低聚对亚苯基亚乙烯基（OPV）分子超分子组装体中分子排列对光激发沿着传递速率的影响.对于定义明确的，螺旋堆叠的单功能OPV快速（约50 ps）光致发光去极化和激发转移到掺杂剂观察，在协议与半相干激子扩散。对于包含间隔物以连接相邻分子的双功能OPV的无序组装，去极化和能量转移动力学发生在较长的时间尺度（纳秒）上。这强烈表明，这种间隔需要仔细调整，因为它们可能会干扰π堆叠，从而减少分子间的电子耦合。(c)2005 Elsevier B.V.保留所有权利。
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.