Effects of π-Conjugation Attenuation on the Photophysics and Exciton Dynamics of Poly(p-phenylenevinylene) Polymers Incorporating 2,2‘-Bipyridines
| Autor: | Michael R. Wasielewski, Mark P. Niemczyk, Wighard J. H. Jäger, Lin X. Chen |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry A. 103:4341-4351 |
| ISSN: | 1520-5215 1089-5639 |
| Popis: | The effect of π-conjugation attenuation on the photophysics and exciton dynamics of two conjugated polymers 1 and 2 are examined in solution. The structures of polymers 1 and 2 have 2,2‘-bipyridyl-5-vinylene units that alternate with one and three 2,5-bis(n-decyloxy)-1,4-phenylenevinylene monomer units, respectively. The photophysics and exciton dynamics of polymers 1 and 2 were compared to those of the homopolymer, poly(2,5-bis(2‘-ethylhexyloxy)-1,4-phenylenevinylene) (BEH−PPV). A series of changes in the photophysics of polymers 1 and 2 were found as a result of π-conjugation attenuation. These changes include blue shifts in absorption and emission spectra, spectral diffusion in stimulated emission, enhancement in photoluminescence quantum yields and lifetimes, and increases in photoinduced absorption intensities and lifetimes. These changes are systematically more pronounced in polymer 1 than in polymer 2 and are correlated with π-conjugation attenuation in the polymers due to twisting of the 2,2‘-bipy... |
| Databáze: | OpenAIRE |
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