Vibrational and electronic relaxation in MEH-PPV using few cycle pulses

被引：1
作者：
Kobayashi, Takayoshi [1 ,2 ,3 ,4 ]
Yamashita, Munenori [1 ]
Du, Juan [1 ,2 ]
Zhang, Jun [1 ]
Iwakura, Izumi [1 ]
机构：
[1] Univ Electrocommun, Adv Ultrafast Laser Res Ctr, Tokyo 1828585, Japan
[2] Japan Sci & Technol Agcy, CREST, Tokyo 1020076, Japan
[3] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 3005, Taiwan
[4] Osaka Univ, Inst Laser Engn, Osaka 5650971, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2013年 / 579卷
关键词：
OPTICAL PARAMETRIC AMPLIFICATION; CONJUGATED POLYMERS; EXCITON DYNAMICS; SPECTROSCOPY; STATES; LASER; ELECTROLUMINESCENCE; EXCITATIONS; TRANSISTORS; GENERATION;
D O I：
10.1016/j.cplett.2013.06.029
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The electronic population decay time is determined to be about 500 fs in (poly-[2-methoxy-5-(2'-ethyl-hexyloxy)-p-phenylenevinylenel (MEH-PPV) using 5.7 fs pulses. The ultrafast electronic dephasing time and the self-trapping time of free exciton to form an exciton polaron is determined as 25 +/- 2 fs and 50 +/- 23 fs, respectively. Real-time spectrogram analysis reveals dynamic mode coupling among the high-frequency and low-frequency modes. The energy-ladder descent vibrational process is clarified using the first moment of the difference absorption spectrum. The phase relaxation time is calculated from the widths of the Fourier spectra of several strongly coupled modes. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码：51 / 57
页数：7
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