New fluorene based tetramers for luminescence applications

Fluorene based polymers have been receiving much attention as promising com ponent in luminescence devices. In this frame the related oligomers reached relevance either as polymeric models or as active layers. On these basis, three fluorenic-core tetramers have been synthetized via organosynthetic ro utes. The molecular, optical and electrochemical characterization of such o ligomers in solution has been performed, furthermore, their high photolumin escence quantum yields (PLQY) render them attractive for electroluminescent device preparations. In this view the optical investigations with both abs orption and emission techniques were also carried out in the solid state sa mples in thin films (up to 80 nm thick) obtained by solution casting or eva poration using ultra high vacuum apparatus. Detailed structural analyses fr om XRD data allowed packing determination, hence the optical properties are related to the different type of aggregation in the solid state. (C) 2001 Elsevier Science B.V. All rights reserved.