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Digitale Medien

Observation of multiple step de-excitation in luminescent single conjugated polymers (2001)

White, J. D. ; Hsu, J. H. ; Yang, Shu-Chun ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 114 (2001), S. 3848-3852

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: The fluorescence intensity fluctuation and polarization modulation of spin-cast single fluorescent conjugated polymers of 2,5-dioctyloxy p-phenylene vinylene (DOO-PPV) with length of the order of the persistence length have been studied. The results indicate that this type of polymer behaves like a collection of semi-independent excitons, with dipoles aligned predominately in the same direction. This suggests that this type of polymer can be considered as a linearly extended rigid structure (i.e., a straight rod). The fluorescent transient exhibits a multiple-step-like behavior with the count rate at each step being a multiple of a common step-size. The fluorescence variation follows the excitation polarization with a DC background observable in some molecules. This DC background indicates that the chromophores in some polymers are not aligned in the same direction. Variations in the Huang–Rhys factor at a single polymer level are also observed. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1343874

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Digitale Medien

The absorption and emission spectra of 1,4-di(2-phenylvinyl)benzene. A theoretical analysis (2000)

Yu, Jenwei ; Fann, W. S. ; Lin, S. H.

Springer

Theoretical chemistry accounts 103 (2000), S. 374-379

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ISSN: 1432-2234

Schlagwort(e): Key words: Spectroscopy – poly(p-phenylene vinylene) – ZINDO

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract. The ground and excited states of 1,4-di (2-phenylvinyl)benzene (PPV3) were studied theoretically and compared with experimental results. The equilibrium geometries of the ground states were found to be nonplanar despite the π conjugation in PPV3; however, the equilibrium geometry of the first excited state of PPV3 is planar, due to the increased π character between the benzene and ethylene units. The electronic structures of the excited state were investigated using the INDO/S-CIS method. The lack of a mirror-image relationship between the absorption and fluorescence spectra of PPV3, obtained experimentally, was analyzed theoretically. It was demonstrated that structural inhomogeneity might be the reason for the particular spectral band shape.