Exciton Dynamics in re-conjugated Polymers and Its Application to High Performance Solid Laser

重共轭聚合物中的激子动力学及其在高性能固体激光器中的应用

• 批准号: 11694156
• 负责人: YOSHINO Katsumi
• 金额: $ 5.57万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11694156/
• 关键词: π-conjugated polymer; conducting polymer; exciton; polaron pair; laser; excited electronic states; photonic band; opal

Various types of n-conjugated polymers have been designed and synthesized to realized a novel solid laser with a high performance and their electronic and optical characteristics have been investigated. The electronic and optical properties such as a photo-excited electronic state in polyacetylene derivatives having various substituents have been investigated by a UV-visible absorption and luminescence measurements and a life time measurement of the luminescence. The relationship between electronic state and molecular structure in π-conjugated polymers with hetero main chain structures including Si atom has been investigated, and it is found that the effective π-conjugation length can be controlled by the introduction of Si atom. Fabrication techniques for solid lasers such as a spin coating and self-assembly methods have been improved and light emission characteristics have been investigated. Based on a nonlinear photoconductivity upon a high intensity excitation in the π-conjugated polymers, an excitation process for the photoconduction has been revealed by means of a pump and probe technique using a femto second high intensity laser. It is found that a polaron pair plays an important role in a photo-excitation process in π-conjugated polymers. The inverse opal of π-conjugated polymer has been fabricated. Poly(3-alkylthiophene) is infiltrated into nano-scale voids of SiO_2 synthetic opal in the melted state and subsequently SiO_2 spheres is removed by a chemical treatment, resulting in the conjugated polymer inverse opal. The reflection spectrum of the polymer inverse opal can be controlled by a thermal treatment and electrochemical doping, which is interpreted to be due to a refractive index change in poly(3-alkylthiophene) based on the change in electronic state upon the temperature change and electrochemical doping.

为了实现高性能的新型固体激光器，设计并合成了各种类型的n-共轭聚合物，并对其电学和光学特性进行了研究。通过紫外-可见吸收光谱、发光光谱和发光寿命的测量，研究了不同取代基的聚乙炔衍生物的电子和光学性质，如光激发电子态。研究了含硅杂原子主链结构的π共轭聚合物的电子态与分子结构的关系，发现有效π共轭长度可以通过硅原子的引入来控制。固体激光器的制造技术如旋涂和自组装方法已经得到改进，并且已经研究了光发射特性。基于π-共轭聚合物在高强度激发下的非线性光电导，利用飞秒高强度激光的泵浦和探测技术揭示了光电导的激发过程。研究发现，极化子对在π共轭聚合物的光激发过程中起着重要的作用。制备了π共轭聚合物反蛋白石。将聚3-烷基噻吩（P3-alkylthiophene）在熔融状态下渗透到SiO_2合成蛋白石的纳米级空隙中，然后通过化学处理去除SiO_2球，得到共轭聚合物反蛋白石。聚合物反蛋白石的反射光谱可以通过热处理和电化学掺杂来控制，这被解释为是由于基于温度变化和电化学掺杂时电子状态的变化的聚（3-烷基噻吩）中的折射率变化。

项目成果

E.Frankevich: "Primary Processes of Charge Carrier Generation in Photoconducting Polymers"Synthetic Metals. 119. 495-498 (2001)

E.Frankevich：“光导聚合物中电荷载流子生成的主要过程”合成金属。

T. Sonoda: "Optical Properties of Self-Assembled Thin-Film of Poly(p-phenylene vinylene)s and Its Application to Light-Emitting Devices with Microring Geometry"Appl. Phys. Lett.. 76. 3227-3229 (2000)

T. Sonoda：“聚（对亚苯基亚乙烯基）自组装薄膜的光学特性及其在微环几何发光器件中的应用”Appl。

E. Frankevich: "Primary Processes of Charge Carrier Generation in Photoconducting Polymers"Synthetic Metals. 119. 495-498 (2001)

E. Frankevich：“光导聚合物中电荷载流子生成的主要过程”合成金属。

S. V. Frolov: "Lasing and Stimulated Emission in π-Conjugated Polymers"IEEE J. Quantum Electronics. 36. 2-11 (2000)

S. V. Frolov：“π 共轭聚合物中的激光和受激发射”IEEE J. Quantum Electronics。36. 2-11 (2000)

R.Hidayat: "Time-resolved study of luminescince in highly luminescent disubstituted polyacetyline and its blend with poorly luminescent monosubstituted polyacetylene"Physical Revew B. 61(印刷中). (2000)

R.Hidayat：“高发光二取代聚乙炔及其与低发光单取代聚乙炔的混合物中发光的时间分辨研究”物理评论 B.61（出版中）。