Photodynamics of Organic Conjugated Rotaxanes

[908418 . goodson]有机大分子系统中激子的动力学是合理制造有机发光器件的核心问题。目前对聚合物和其他有机大分子结构中的激子衰变和分子间效应的理解有待改进。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态和液相中的动力学。这项工作将为大分子结构-性能关系提供急需的见解，并可能导致优越的有机发射器件材料的创造。选择将调用的方法是为了更深入地了解材料的结构-属性关系。它首先涉及探测不同的分子间有机材料。利用飞秒分辨发光实验研究了一种新型有机共轭轮烷聚合物中单线态激子的发射衰变。在各种溶液（好溶剂和坏溶剂）中，聚集体（和准分子形成）的程度可以通过超快速上转换技术来测量。在一组具有不同数量轮烷基团的分子中，将研究轮烷分子抑制链间猝灭机制的能力。本研究可以定性地了解轮烷在抑制分子间猝灭发光中的作用。它将为一个专注于理解这些电致发光聚合物中激子动力学的程序提供基础，这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.