Photodynamics of Organic Conjugated Rotaxanes

9908418Goodson有机大分子系统中激子的动力学对于有机发光器件的合理创造具有重要意义。需要改进目前对聚合物和其他有机大分子结构中激子衰减和分子间效应的理解。在这项工作中，将进行详细的光物理研究，以探索有机共轭轮烷大分子在凝聚相和液体中的动力学。这项工作将使人们对大分子结构-性能关系有更深入的了解，并可能创造出更好的有机发光器件材料。选择将被援引的方法是为了更深入地了解材料的结构-性质关系。它首先涉及到探索不同的分子间有机材料。利用飞秒时间分辨发光实验测量了一种新型有机共轭轮烷聚合物中的单重态激子发射衰变。在各种溶液(好的和坏的溶剂)中，聚集的程度(和准分子的形成)可以通过超快上转换技术来测量。轮烷分子抑制链间猝灭机制的能力将通过一组具有不同数量的轮烷基团的分子来研究。这一研究将有助于定性地理解轮烷在抑制分子间发光猝灭中的作用。这将为一个专注于了解这些电致发光聚合物中激子动力学的计划提供基础，该计划可能会在发光二极管中找到应用。

9908418GoodsonThe dynamics of excitons in organic macromolecular systems is of central concern toward the rational creation of organic light emitting devices. Improvement in the present understanding of exciton decay and intermolecular effects in polymers and other organic macromolecular architectures is needed. In this work detailed photo-physical investigations will be carried out to probe the dynamics of organic conjugated rotaxane macromolecules in the condensed and liquid phases. This work will give much needed insight into the macromolecular structure-property relationships and could lead to the creation of superior organic emitting device materials. The methodology that will be invoked was chosen in order to gain a deeper insight into the material's structure-property relationships. It first concerns probing different intermolecular organic materials. Measurements of the singlet exciton decay by emission in a novel organic conjugated rotaxane polymer will be investigated by femto-second time resolved luminescence experiments. In various solutions (good and bad solvents) the degree of aggregation (and excimer formation) can be measured by the ultra-fast upconversion technique. The ability of the rotaxane molecules to inhibit the interchain quenching mechanisms will be investigated with a set of molecules with varying numbers of rotaxane groups attached.This research could lead to a qualitative understanding of the role of rotaxanes in inhibiting intermolecular quenching of luminescence. It will provide a base for a program focused on understanding the dynamics of excitons in these electroluminescent polymers, which could find application toward light-emitting diodes.