权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Investigation of the Emission Mechanism and Property Control of Highly Fluorescent Polyimides via Application of High Static Pressure

高静压高荧光聚酰亚胺的发射机理和性能控制研究

基本信息

批准号：
16350122
负责人：
ANDO Shinji
金额：
$ 9.66万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The investigators aimed to clarify the photo-absorption and fluorescent emission behaviors of conventional polyimides (PIs) and highly fluorescent PIs by applying high/very high static pressure (1.0-90,000 atm) to PI thin films. The intermolecular distances between PI chains are effectively reduced at elevated pressures, which straightforwardly enhance the intermolecular charge transfer (CT) interactions. In addition, novel thermally stable PIs having optical functionalities can be developed based on findings. For the experiments, "high hydrostatic pressure cell method" and "diamond anvil (DA) method" were adopted to apply high (<400 MPa) and very high pressures (<10 GPa) to PI thin films, respectively. The variations in optical properties and structural changes of the PI films generated at high pressures were precisely measured by using not only conventional spectroscopies but also micro spectrophotometric techniques. Furthermore, the photophysical mechanisms of the fluorescent emission at high quantum yields (0.3 or more) observed for the highly fluorescent PIs were partly clarified by these experiments. In addition, various interesting phenomena which lead to the development of novel thermally stable optical materials having high functionalities were observed. Moreover, the methods developed in this study and the findings obtained in the experiments are beneficial to improve the performance of the highly fluorescent PIs with increasing the quantum yields and the emission of strong white luminescence.

研究人员旨在通过对PI薄膜施加高/非常高的静压（1.0- 90，000 atm）来阐明传统聚酰亚胺（PI）和高荧光PI的光吸收和荧光发射行为。PI链之间的分子间距离在升高的压力下有效地减小，这直接增强了分子间电荷转移（CT）相互作用。此外，基于这些发现，可以开发具有光学功能的新型热稳定PI。实验中采用“高静水压池法”和“金刚石压砧法”分别对PI薄膜施加高压（<400 MPa）和超高压（<10 GPa）。不仅使用常规光谱法，而且还使用显微分光光度技术精确测量了高压下产生的PI膜的光学性质变化和结构变化。此外，通过这些实验部分地阐明了在高荧光PI中观察到的高量子产率（0.3或更高）下的荧光发射的物理机制。此外，各种有趣的现象，导致具有高功能的新型热稳定光学材料的发展被观察到。此外，在这项研究中开发的方法和实验中获得的结果是有益的，以提高量子产率和发射强白色发光的高荧光PI的性能。