期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 115, 期 14, 页码 2913-2919出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp1109042
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资金
- Engineering and Physical Sciences Research Council
- EPSRC [EP/E036244/1, EP/E062636/1, EP/E065066/1, EP/F05999X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E036244/1, EP/F05999X/1, EP/E065066/1, EP/E062636/1] Funding Source: researchfish
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 n(0.5) dependence on the number of fluorene units in each arm.
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