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）的兴奋性非线性。激子的放松机械性。 S） - 2-甲基丁丁）乙基]，使用最大的χ^<（3）通过拟合过程来测量最大的χ^<（3）。固定膜的刺激分别为20和36个硫芬环。2）时间分辨的聚噻吩衍生物的时间分辨的光致发光光谱，是振动结构的观点，是动态的）。奇数1BU成分和事件2AG分量。来自两个状态的荧光具有不同的振动结构，他的模型还可以很好地解释了许多其他π共轭聚合物的动力学。

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。

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.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。

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.: "Distribution of the effective conjugation length of polythiophene determined by its absorption and |χ^<(3)>| spectra"J.Nonlinear Opt.Phys.Mater.. 9. 55-61 (2000)

T.Kobayashi 等人：“由其吸收和 |χ^<(3)>| 光谱确定的聚噻吩有效共轭长度的分布”J.Nonlinear Opt.Phys.Mater.. 9. 55-61 (2000 ）