کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9575109 | 1504341 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Excited state dynamics of a conformationally disordered conjugated polymer: A comparison of solutions and film
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
We compare poly[2-methoxy,5-(2â²-ethyl-hexoxy)-1,4-phenylenevinylene] (MEH-PPV) solutions in chlorobenzene, toluene and tetrahydrofuran with a film of MEH-PPV spun cast from chlorobenzene solution using the three-pulse photon echo (3PEPS) experiment to examine the origins of line broadening in these systems which are obscured in spectral line shapes. We have simulated the 3PEPS data simultaneously with the absorption and fluorescence spectra to elucidate the timescales characteristic of relaxation processes. Simulations show a rapid localization of excitation in the initial â¼20Â fs. The conformation of chains in solution and film dictates the Coulomic interaction between proximate subunits which in turn influences the extent of initial delocalization, chromophore size and energy transfer. We report an increased energy transfer efficiency in the films as compared to the solutions as evidenced by the decay of the peak shift to zero.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 318, Issues 1â2, 15 November 2005, Pages 21-32
Journal: Chemical Physics - Volume 318, Issues 1â2, 15 November 2005, Pages 21-32
نویسندگان
Tieneke E. Dykstra, Vitalij Kovalevskij, Xiujuan Yang, Gregory D. Scholes,