CAREER: Toward Photocontrol of Conjugated Polymer Emission: Modulation of Fluorescence Properties in Photochromic Poly(p-phenylenevinylene) Derivatives

职业：共轭聚合物发射的光控制：光致变色聚（对亚苯基亚乙烯基）衍生物中荧光性质的调节

• 批准号: 0642513
• 负责人: Elizabeth Harbron
• 金额: $ 40.4万
• 依托单位: College of William and Mary
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-04-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0642513&HistoricalAwards=false
• 关键词: CAREER; Toward; Photocontrol; Conjugated; Polymer

With the support of the Organic and Macromolecular Chemistry Program in the Chemistry Division, Professor Elizabeth J. Harbron of the College of William and Mary will develop photoluminescent (PL) polymers whose fluorescence and emission color can be modulated by light-activated isomerization of pendant groups. Potential suggested applications for these materials include photo switching and memory storage. Several new photochromic poly (p-phenylenevinylene) (PPV) derivatives will be synthesized and studied in solution and film. The first area of investigation will be a derivative in which energy transfer from the polymer backbone occurs selectively to only one form of the pendant photochrome. Thus, PPV will emit with unquenched intensity when the photochrome is in one form and will not emit when the photochrome is in its resonant form due to efficient energy transfer. This polymer will facilitate true on/off reading of a fluorescence signal and will also enable all-optical write/read/erase cycles in polymer films. Additional studies will focus on control of emission intensity through photoinduced photochrome alignment, which will be studied on the single molecule level. Time-resolved fluorescence techniques will be employed to study all photochromic PPV derivatives to investigate the interplay between exciton migration within the PPV chain and energy transfer to pendant photochromic acceptors. The results of measurements with different photochromic side chains will be used to identify the combination of PPV and side chain energetic characteristics required for an optimal photoswitch polymer.. With the support of this CAREER award from the Organic and Macromolecular Chemistry Program, Professor Harbron will work with materials that are simple, and synthetically accessible to provide a fundamental understanding of the processes involved in switching phenomena with the real benefit being provided by the optical measurements and experiments. Broader impacts of the proposed activity are primarily the training of undergraduates in polymers, organic synthesis, and photophysics. Professor Harbron will continue getting undergraduate researchers involved in projects and in publishing in ACS journals. She has also proposed summer course for high school students.

在化学系有机和大分子化学项目的支持下，威廉和玛丽学院的Elizabeth J. Harbron教授将开发光致发光（PL）聚合物，其荧光和发射颜色可以通过侧基的光激活异构化来调节。这些材料的潜在应用包括光开关和存储器。本文合成了几种新型的光致变色聚对苯撑乙烯（PPV）衍生物，并对其溶液和薄膜进行了研究。研究的第一个领域将是一个衍生物，其中从聚合物主链的能量转移发生选择性地只有一种形式的悬垂光致变色。因此，PPV在光致变色物处于一种形式时将以未猝灭的强度发射，并且在光致变色物处于其共振形式时由于有效的能量转移而将不发射。该聚合物将促进荧光信号的真正开/关阅读，并且还将使聚合物膜中的全光学写入/读取/擦除循环成为可能。进一步的研究将集中在通过光致光致变色排列控制发射强度，这将在单分子水平上进行研究。时间分辨荧光技术将被用来研究所有的光致变色PPV衍生物，以调查PPV链内的激子迁移和能量转移到悬垂的光致变色受体之间的相互作用。不同的光致变色侧链的测量结果将用于确定最佳光开关聚合物所需的PPV和侧链能量特性的组合。在有机和大分子化学计划的职业奖的支持下，哈布伦教授将使用简单且可合成的材料，以提供对切换现象所涉及的过程的基本理解，并通过光学测量和实验提供真实的益处。拟议活动的更广泛的影响主要是在聚合物，有机合成和物理学的本科生的培训。哈布伦教授将继续让本科研究人员参与项目，并在ACS期刊上发表文章。她还建议为高中生开设暑期课程。