کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9586237 | 1505939 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Excitonic intraband relaxation and polarization anisotropies in PTCDA on femtosecond and picosecond timescales
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Excitonic intraband relaxation and polarization anisotropies in PTCDA on femtosecond and picosecond timescales Excitonic intraband relaxation and polarization anisotropies in PTCDA on femtosecond and picosecond timescales](/preview/png/9586237.png)
چکیده انگلیسی
We report on investigations of optical excitations in polycrystalline organic molecular crystals with quasi-1D-stacked crystal structure and negative exciton dispersion. As model system, we choose thin films of the perylene derivative 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA). Using pump-probe spectroscopy, we show how the relaxation from the absorbing state towards the border of the Brillouin zone occurs on a 120Â fs timescale. Time-resolved luminescence anisotropy gives evidence that as a result of the coherent coupling between adjacent stacks, populations of the Davydov-split states that are prepared during photo-excitation relax into the emitting states in less than 5Â ps. The behavior of the luminescence anisotropy can be explained by the orientation of the two PTCDA molecules in the unit cell. However, a full understanding of the ultrafast pump-probe anisotropy requires novel explanations beyond current models.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 112, Issues 1â4, April 2005, Pages 299-302
Journal: Journal of Luminescence - Volume 112, Issues 1â4, April 2005, Pages 299-302
نویسندگان
E. Engel, M. Koschorreck, K. Leo, M. Hoffmann,