Materials with high fluorescence in solid state: The influence of chemical structure on optical properties

abstract

English

Study of a relationship between fluorescence emission in a solid state and chemical structure has received considerable attention in the recent years. Acquisition of new material with high emission in the solid state is important, particularly because of their multiple potential applications such as organic light-emitting diodes, organic light emitting thin-film transistors and organic solid state lasers. The performance of conjugated molecules in solution and in solid state is very different due to molecular aggregation. This difference is caused by intermolecular interaction of the excited molecules with the adjacent molecules. This interaction may be caused by transfer of energy and electrons, formation of excimers etc. This interaction leads to new quenching channels that reduce fluorescence emission. Most of these interactions depend on the distance between the molecules and their mutual position. Relatively small variation of the chemical structure brings significantly different molecules geometry in solid-state and thus diverse optical properties. Dependence on distance between π-conjugated planes were studied using diketopyrrolopyrrole sulfonic anionts with varying size of the counter cations. The influence of chemical structure modification was investigated with the help of various donor-π-conjugated bridge-acceptor molecules where the bridge represents framework with bulky substituents oriented perpendicular to π-conjugated plane. Optical properties such as absorption, fluorescence, fluorescence quantum yield (PLQY) and lifetime in the solid state were studied and discussed.

solid state fluorescence, fluorescence quantum yields, fluorescence lifetime, diketopyrrolopyrrole

KOUTNÝ, J.; VALA, M.; LUŇÁK, S.; PAUK, K.; ELIÁŠ, Z.; IMRAMOVSKÝ, A.; WEITER, M.

2. 9. 2015

978-80-214-5228-2

Chemistry and Life 2015 - Book of Abstacts

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