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Abstract
A detailed study of the low-energy optical transitions in two families of star-shaped molecules is presented. Both families have 3-fold rotational symmetry with oligofluorene arms attached to a central core. In one family, the core of the molecule is a rigid meta-linked truxene, while the other is a meta-linked benzene moiety. The low-energy transitions were studied both experimentally and using time-dependent density functional theory (TD-DFT). The optical transitions of these new star-shaped molecules were compared with corresponding linear oligofluorenes. Both families of star-shaped molecules showed higher absorption and fluorescence dipoles and photoluminescence quantum yields than straight chain oligofluorenes. TD-DFT calculations show that absorption takes place across the entire molecule, and after excited state relaxation, the emission results from a single arm. In both theory and experiment the transition dipole moments show an approximate n0.5 dependence on the number of fluorene units in each arm.
Original language | English |
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Pages (from-to) | 2913-2919 |
Number of pages | 7 |
Journal | Journal of Physical Chemistry A |
Volume | 115 |
Issue number | 14 |
DOIs | |
Publication status | Published - Mar 2011 |
Keywords
- fluorene molecules
- star-shaped organic semiconductors
- absorption of light
- optical excitations
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Projects
- 1 Finished