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Synthesis of organic nanomaterials requires precise control on many technological parameters. For instance, drying and crystallization speed define conformation of the chemical structure and main fundamental properties of the organic luminophores. Deviation from the fabrication protocol results in forming of polymorphous structures with same chemical composition but different structural, electronic and optical properties.
In the present work, 1-(2-(3,6-dimethyl-9H-carbazol-9-yl) benzyl) pyridin-1-ium methanesulfonate (KL1421) has been crystallized with different drying rates. Structure and electronic properties of the polymorphous samples have been studied by NMR, XRD, FTIR and Raman spectroscopy. Investigation of optical properties by photoluminescence showed changes of the quantum yield and emission peak position. Activation energies have been studied by temperature quenching of the photoluminescence. Correlation between structure, optical and technological parameters have been proposed.
