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
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Excited state dynamics of a conformationally disordered conjugated polymer: A comparison of solutions and film
چکیده انگلیسی
We compare poly[2-methoxy,5-(2′-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 ∼20 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 1–2, 15 November 2005, Pages 21-32
نویسندگان
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