Excitonic nonlinearity of regioregular π-conjugated polymer

区域规整π共轭聚合物的激子非线性

• 批准号: 11440099
• 负责人: EMA Kazuhiro
• 金额: $ 8.96万
• 依托单位: Sophia 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 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440099/
• 关键词: polymer; exciton; nonlinear optics; polythiophene; Langmuir-Blodgett (LB) films; low-dimensional material; conjugation length; relaxation mechanism; π共役系高分子; 電子格子相互作用; 4光波混合; 非線形効果; Ag励起状態; コヒーレントフォノン; フォノン; ラマン散乱; フェムト秒パルス; 非線形分光; ポリマー

We investigated excitonic nonlinearity of polythiophene derivative poly(3-[2-((S)-2-methylbutoxy)ethyl]thiophene), which has good regularity in structure. Our study focused two points ; 1) the dependence of excitonic nonlinearity on the effective conjugation length, 2) the relaxation mechnism of exciton. Our research results are following ;1) Third-order optical nonlinearity around excitonic resonance in spincoated films and Langmuir-Blodgett (LB) films of polythiophene derivative, poly(3-[2-((S)-2-methylbutoxy)ethyl]thiophene), is measured using degenerate four wave mixing method. The largest χ^<(3)> value (〜10^<-7> esu) in conjugated polymers is obtained. By a fitting procedure on absorption spectrum and χ^<(3)> spectrum, the average effective conjugation lengths of the spincoated film and the LB film are estimated to be approximately 20 and 36 thiophene rings, respectively.2) The time-resolved photoluminescence spectrum of a polythiophene derivative has been analyzed from the viewpoint of the vibronic structure and its dynamics. We found that the photoluminescence (PL) originates from two mixed states that consist of the odd-parity 1Bu component and the even-parity 2Ag component. Since the fluorescence from the two states have different time constants and different vibronic structure, the PL shows a biexponential decay and a spectral change. This model also explains the PL spectrum and its dynamics of many other π conjugated polymers quite well.

我们研究了聚噻吩衍生物聚（3- [2 - （（S）-2-甲基丁氧基）硫苯）的令人兴奋的非线性，该乙烯在结构上具有良好的规律性。我们的研究重点是两点。 1）令人兴奋的非线性对有效共轭长度的依赖性，2）令人兴奋的松弛机械。我们的研究结果是遵循的； 1）使用变性四波混合方法测量了链状膜和langmuir-blodgett（LB）膜的三阶光学非线性和langmuir-blodgett（LB）膜的胶片（3- [2 - （（S）-2-甲基布毒素）乙二醇），使用变性四波混合方法来测量。获得了共轭聚合物中最大的χ^<（3）>值（〜10^<-7> ESU）。通过对抽象光谱和χ^<（3）>频谱的拟合程序，估计分别估计链状膜和LB膜的平均有效共轭长度约为20和36硫芬环。我们发现光致胶（PL）来自两个混合状态，这些状态由奇数1BU成分和偶数2AG分量组成。由于来自两个状态的荧光具有不同的时间常数和不同的振动结构，因此PL显示了Biexpenential衰减和光谱变化。该模型还很好地解释了许多其他π共轭聚合物的动态。

项目成果

K.Ochiai, et al.: "Structure and Properties of Chiral Poly(3-substituted thiophene) Langmuir-Blodgett Films"Synthetic Metals. 101. 84-85 (1999)

K.Ochiai 等人：“手性聚（3-取代噻吩）Langmuir-Blodgett 薄膜的结构和性能”合成金属。

S.Kishino: "Estimation of the effective conjugation length of polythiophene from its |X^<(3)>(w;w,w,-w)|spectrum at excitonic resonance"Phys.Rev.B. 58. 13430-13433 (1998)

S.Kishino：“根据激子共振下的 |X^<(3)>(w;w,w,-w)| 谱估计聚噻吩的有效共轭长度”Phys.Rev.B。

T.Kobayashi, et al.: "Self-trapped exciton dynamics in highly ordered and disordered films of polythiophene derivative"Phys.Rev.B. 62. 8580-8583 (2000)

T.Kobayashi 等人：“聚噻吩衍生物高度有序和无序薄膜中的自陷激子动力学”Phys.Rev.B。

T.Kobayashi, et al.: "Fluorescence from the even-parity state in π conjugated polymer"J.Phys.Soc.Jpn.. 70, (in press). (2001)

T.Kobayashi 等人：“π 共轭聚合物中偶宇称态的荧光”J.Phys.Soc.Jpn.. 70，（出版中）。

T.Endo, et al.: "Regiocontrolled synthesis of poly(thiophene)derivatives : EL devices utilizing chiral poly(thiophene)derivatives"Synthetic Metals. 119. 191-192 (2001)

T.Endo 等人：“聚（噻吩）衍生物的区域控制合成：利用手性聚（噻吩）衍生物的 EL 器件”合成金属。