Photophysics of segmented block PPV copolymer derivatives

The photophysics of the luminescent dimethoxy-substituted chromophore, [(2,6-dimethoxy-1,4 phenylene)-1,2 ethenylene-(2,5-dimethoxy-1,4 phenylene)-1,2 ethenylene-(3,5-dimethoxy-1,4 phenylene)] is studied in a series of segmented block copolymer, monomer, and polymer samples. Fluorescence lifetimes o...

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Bibliographic Details
Published in:Synthetic metals 2001-01, Vol.116 (1), p.189-192
Main Authors: Kyllo, Erica M, Gustafson, Terry L, Wang, Daike K, Sun, Runguang G, Epstein, Arthur J
Format: Article
Language:English
Subjects:
Applied sciences
Electrical, magnetic and optical properties
Electronic polymers
Exact sciences and technology
Exciton confinement
Organic polymers
Photoluminescence
Physicochemistry of polymers
Poly(phenylene vinylene) derivatives
Properties and characterization
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Summary:The photophysics of the luminescent dimethoxy-substituted chromophore, [(2,6-dimethoxy-1,4 phenylene)-1,2 ethenylene-(2,5-dimethoxy-1,4 phenylene)-1,2 ethenylene-(3,5-dimethoxy-1,4 phenylene)] is studied in a series of segmented block copolymer, monomer, and polymer samples. Fluorescence lifetimes of the monomer and segmented block copolymer solution and thin film were determined over a temperature range from 77 to 298 K. Comparison of absorbance and emission spectra and time-resolved fluorescence studies indicate exciton confinement in the chromophore moities of the segmented block copolymer, leading to near unity quantum efficiency. Steady state absorption spectra show an increasing blue-shifted peak upon formation of the spin-coated thin film. Conformational geometry in the monomer thin film facilitates excimer formation, especially evident at low temperatures.
ISSN:0379-6779
1879-3290
DOI:10.1016/S0379-6779(00)00484-7