Elementary excitations in electroluminescent one-dimensional conjugated polymers

电致发光一维共轭聚合物的基本激发

基本信息

批准号：
09440116
负责人：
KURODA Shin-ichi
金额：
$ 1.6万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440116/
关键词：
Conjugated polymers Electroluminescent polymers Nonlinear excitations Polaron ESR ENDOR One-dimensional electron system

项目摘要

Recent discovery of electroluminescence in a polymer, poly (phenylene vinylene) , PPV has brought much attention to polarons, a nonlinear excitation in one-dimensional conjugated polymers, as a candidate of charge carriers responsible for electroluminescence through charge recombination. We have shown that ESR and ENDOR spectroscopies are useful in observing the microscopic shapes of paramagnetic excitations in conjugated polymers. The purpose of the present project is to conduct ESR and ENDOR observations of polarons generated by light illumination, doping etc. in PPV and its derivatives and to develop a theoretical model to analyze the data to obtain the polaron shapes as well as the electronic states of polymers.In this year, we have been successful in determining the detailed shape of polarons in PPV and the magnitudes of Coulomb interactions affecting the shape by analyzing the ENDOR and newly obtained TRIPLE (electon-nuclear-nuclear triple resonance) data of trapped polarons in the dark state of the polymer, provided from Dr. T.Ohnishi of Sumitomo Chemical Co. The obtained results with the maximum spin densities reside on vinylene sites successfully explained the reduction of ODESR linewidth in a derivative, cyano-PPV where the protons of vinylene sites are substituted by cyano groups, reported by British and American groups. The results have been published in JPSJ.In addition to these, light-induced ESR (LESR) of photogenerated polarons has been successfully detected in cyano-substituted PPV derivatives provided from Prof. R.H.Friend of Cavendish Laboratory. The analysis of the observed LESR line shapes as well as the excitation spectra of LESR intensities are currently under progress to study the effect of molecular structures on the polaron shapes and the electronic states of one-dimensional polymers.

PPV最近在聚合物聚合物聚合物（苯基乙烯基）中发现了电致发光，这引起了极大的关注，极性（一种在一维共轭聚合物中的非线性激发）作为电荷载体的候选电荷载体，这些载体是通过电荷重组来负责电致发光的。我们已经表明，ESR和Endor光谱可用于观察共轭聚合物中顺磁激发的微观形状。本项目的目的是对PPV及其衍生物中的光照明，掺杂等产生的极性子进行ESR和END观察，并开发出一种理论模型来分析数据以获得极化的形状以及今年的聚合物的电子状态。在今年的聚合物中，我们已经成功地确定了PPV的详细形状，即在PPV中的详细形状，COLS形状的形状是元素的元素。 ENDOR and newly obtained TRIPLE (electon-nuclear-nuclear triple resonance) data of trapped polarons in the dark state of the polymer, provided from Dr. T.Ohnishi of Sumitomo Chemical Co. The obtained results with the maximum spin densities reside on vinylene sites successfully explained the reduction of ODESR linewidth in a derivative, cyano-PPV where the protons of vinylene sites are由英国和美国群体报道的Cyano群体代替。该结果已发表在JPSJ.IN中，此外，在Cavendish Laboratory的R.H.提供的Cyano取代的PPV衍生物中，已成功检测到了光催化极化子的光诱导的ESR（LESR）。目前正在进行研究观察到的LESR线形状以及LESR强度的激发光谱，以研究分子结构对极性形状和一维聚合物的电子状态的影响。