Infrared Photorefractive and Light-Emitting Polymers for Optical Technologies

用于光学技术的红外光折变和发光聚合物

• 批准号: 0108696
• 负责人: Nasser Peyghambarian
• 金额: $ 36万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0108696&HistoricalAwards=false
• 关键词: Infrared; Photorefractive; Light; Emitting; Polymers

Objectives. We propose an experiment - theory effort focused on the development of two classes of multifunctional organic materials to be used for information technologies. The first class of ma-terials consist of infrared compatible photorefractive polymers that are suitable for reconfigurable filters, switches and interconnects. The second class of materials are pi-conjugated polymers with emission in the infrared. This effort will capitalize on our past experience in developing photorefrac-tive and light emitting polymers through a combination of many-body calculations incorporating electron-electron interactions on these materials and the characterizations of their electrical and nonlinear optical properties. The operation of existing photorefractive and light emitting polymers is restricted to the visible region of the spectrum which prevents their use in telecommunication.Approach. To extend the spectral sensitivity of photorefractive polymers to the infrared we will use multiphoton absorption to generate photoconductivity from high energy two-photon excited states in either a pi-conjugated polymer matrix or an electro-active chromophore dopant. Theo-retical work will be performed in identifying two-photon states from which enhanced photogener-ation efficiency is expected. These results will also guide the design of one-photon photorefractive polymers with sub-millisecond response time. The search for pi-conjugated polymers with photo-luminescence in the infrared will build on our recent discovery of the principle that excited state ordering conducive to light emission at low frequencies is obtained in pi-conjugated polymers with large molecular unit cells. The specific structural requirement is that there exists molecular conju-gation transverse to the direction of conjugation along the polymer chain, leading to longitudinal confinement and transverse delocalization of the optical exciton. Experimental studies will be con-ducted on soluble derivatives of poly(isothianaphthene), which satisfy the structural requirement for infrared emission.Significance and Impact. The proposed infrared compatible photorefractive and light emitting polymers will enable new devices for telecommunication technologies. In spite of the rapid advances made in the area of organic optoelectronics, existing organic materials amid devices operate largely in the visible region of the electromagnetic spectrum. Our work will extend the spectral range of applications, and it is expected that the outcomes of our research will have strong impact on the device physics of organic materials. The aim is not to compete with the technology utilizing con-ventional inorganic semiconductors, but to develop new functionalities and applications, utilizing the unique processing capability of organic materials. Importantly, the strong coupling between experiment and theory will lead to enhanced understanding of the fundamental processes of photo-generation, multiphoton absorption and light emission in organics, an area that is still in its infancy. Finally, the proposed research provides a unique multidisciplinary framework to integrate research and teaching. Students working on the project are exposed to chemistry, optics, engineering, and the fundamental physics of nonlinear absorption, charge-injection, charge- and energy-transfer, and light emission.

目标。我们提出了一个实验 - 理论工作，重点是开发两类的多功能有机材料，用于信息技术。第一类MA-Perials由适合可重新配置过滤器，开关和互连的红外兼容光致热聚合物组成。第二类材料是红外发射的PI偶联聚合物。这项努力将利用我们过去在开发PhotoReFrac-Tive和Light发光聚合物的经验中，结合了这些材料上的电子 - 电子相互作用以及其电气和非线性光学特性的特征的多体计算。现有的光致热和发光聚合物的运行仅限于频谱的可见区域，该区域阻止了它们在电信中的使用。为了扩展光捕获聚合物对红外的光谱敏感性，我们将使用多光子吸收来从高能两光激发态在PI结合聚合物基质或电动伪装型掺杂剂中产生光导率。将在识别两光子状态的情况下进行神学工作，从中可以从中提高光生效率。这些结果还将指导具有亚毫秒响应时间的单光子光致热聚合物的设计。在红外线中搜索具有光亮发光的PI偶联聚合物将建立在我们最近发现的原理上，即激发态排序有利于在较大的分子单位细胞的PI偶联聚合物中获得有利于低频的光发射的原理。具体的结构要求是，存在分子固定横向沿聚合物链结合方向的方向，从而导致光激子的纵向限制和横向离域化。实验研究将以聚（同心苯二芬）的可溶性衍生物进行结合，该衍生物满足红外发射的结构要求。意义和影响。拟议的红外兼容光致热和发光聚合物将为电信技术提供新的设备。尽管在有机光电子的领域取得了迅速的进步，但现有的有机材料在电磁谱的可见区域中很大程度上运行。我们的工作将扩大应用的光谱范围，预计我们的研究结果将对有机材料的设备物理产生强大的影响。其目的不是与使用无机半导体的技术竞争，而是利用有机材料的独特处理能力来开发新的功能和应用。重要的是，实验与理论之间的强耦合将导致对有机物中光发射，多光子吸收和光发射的基本过程的理解，这是一个仍处于起步期的领域。最后，拟议的研究提供了一个独特的多学科框架，以整合研究和教学。从事该项目的学生暴露于化学，光学，工程学以及非线性吸收，注入注入，电荷和能量转移以及光发射的基本物理。