Femtosecond pump-probe spectroscopy of excited states in conjugated polymers for organic electronics

有机电子共轭聚合物中激发态的飞秒泵浦探针光谱

• 批准号: 33628232
• 负责人: Dr. Frédéric Laquai
• 金额: --
• 依托单位: Cavendish Laboratory
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/33628232?language=en
• 关键词: Femtosecond; pump; probe; spectroscopy; excited

The further development of conjugated polymers for optoelectronic applications, for example organic light emitting diodes (OLEDs), field-effect transistors, organic lasers and photovoltaics requires a complete understanding of their photophysical properties. Therefore, a variety of different experimental techniques has to be applied with experiments ranging from time-resolved photoluminescence spectroscopy covering the time range from femtoseconds up to seconds, over charge carrier mobility measurements towards application and characterisation of the investigated materials in organic electronic devices. The intended research project aims for an understanding of the photophysical properties of a novel series of ladder-type conjugated polymers which are highly promising candidates for organic electronics. In particular, femtosecond pump-probe spectroscopy and photoinduced absorption (PIA) studies shall be conducted on these materials to study excited state absorption originating from singlet and triplet excitons as well as polarons (radical anions / cations), which are known to play an important role in organic electronic devices and can severely limit the applicability of conjugated polymers in organic solid state lasers. Preparation of organic electronic devices, especially feedback structures for organic solid state lasing as well as organic solar cells is planned to correlate the results of the photophysical characterisation with properties in electronic devices and to develop reliable structure-property relationships.

共轭聚合物在光电子应用中的进一步发展，例如有机发光二极管（OLED），场效应晶体管，有机激光器和光电子器件，需要完全了解它们的电子物理性质。因此，各种不同的实验技术必须应用于实验范围从时间分辨的光致发光光谱覆盖的时间范围从飞秒到秒，在电荷载流子迁移率测量对应用和表征的研究材料在有机电子器件。该研究项目旨在了解一系列新型梯形共轭聚合物的物理性质，这些聚合物是有机电子学的极有前途的候选者。特别是，应在这些材料上进行飞秒泵浦-探测光谱和光致吸收（PIA）研究，以研究源自单重态和三重态激子以及极化子（自由基阴离子/阳离子）的激发态吸收，已知这些激子在有机电子器件中起重要作用，并可能严重限制共轭聚合物在有机固态激光器中的适用性。有机电子器件的制备，特别是用于有机固态激光以及有机太阳能电池的反馈结构，计划将电子器件中的物理特性的结果与性能相关联，并开发可靠的结构-性能关系。