Synthesis and characterization of luminescent poly(ester-imide) derivatives constituted of alternating spirobifluorene moiety

A new category of luminescent poly(ester-imide)s derivatives based on spirobifluorene rings in the main chain was synthesized from 2,6-bis(4-hydroxybenzylidine)cyclohexanone (BC) derivatives and diimide-dicarboxylic acid (DIDA) containing spirobifluorene moiety. The structure of the polymer was confirmed by elemental and spectral analyses. The various characteristics of the resulting polymers including optical properties, solubility, thermal analysis, and X-ray diffraction analysis were determined and discussed. The new polymers showed relatively high glass-transition temperatures (about 200 °C) and good thermal stability. Two polymers emitted blue-greenish light with photoluminescence (PL) emission maxima around 400–600 nm and the electron affinity of new polymers was estimated as 2.75–2.84 eV. Cyclic voltammetry displayed that both conjugated polymers had reversible oxidation and irreversible reduction, making them n-type electroluminescent materials.Figure optionsDownload as PowerPoint slide

► New category luminescent poly(amide-ester)s derivatives based on spirobifluorene rings were synthesized as n-type electroluminescent materials.
► Two new polymers emitted blue-greenish light with PL emission maxima around 400–600 nm.
► The electron affinity of new polymers was estimated as 2.75–2.84 eV.
► Cyclic voltammetry displayed that both conjugated polymers had reversible oxidation and irreversible reduction, making them.