期刊
CHEMICAL PHYSICS LETTERS
卷 342, 期 5-6, 页码 555-562出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(01)00657-1
关键词
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Exciton delocalization in the conjugated polymer poly(p-phenylene vinylene) (PPV) is investigated using temperature-dependent spectroscopy. As the temperature is lowered, the steady-state absorption and fluorescence spectra indicate increased electronic conjugation and exciton delocalization. Femtosecond transient absorption measurements at 20 and 290 K over the wavelength range 520-650 nm provide evidence that such delocalization occurs within the first 10 ps after photoexcitation. Comparison of the 20 and 290 K data, along with anisotropy studies, suggests that vibrational cooling plays a significant role in the spectral dynamics observed in PPV on this timescale. (C) 2001 Elsevier Science B.V. All rights reserved.
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