Title Design, synthesis and investigation of coumarine based compounds /
Translation of Title Kumarino junginių projektavimas, sintezė ir tyrimas.
Authors Samuel, Nizy Sara
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Pages 61
Keywords [eng] coumarin ; phenoxazine ; fluorescence ; optoelectronics ; organic electroluminescent materials
Abstract [eng] The ever increasing need for organic luminescent materials in the field of optoelectronics have led to several research studies across the world. Organic functional materials possessing high stability and solubility are focussed for economical optoelectronic devices. Over the years, coumarins have found applications in optoelectronic devices owing to their myriad of characteristics especially their intrinsic optical properties and ease of synthesis. Here in this study, coumarin derivatives substituted with trifluoromethyl moiety at different positions was opted as the acceptor core and conjugated with strong donor ─ phenoxazine. Four coumarin based derivatives were designed and synthesized with relatively high reaction yields. Various characteristics such as photophysical, electrochemical and thermal of the synthesized compounds were investigated. Analysis of the effect of heat on the target compounds was done using differential scanning calorimetry and thermogravimetric analysis. It was found that the materials were thermally stable with glass forming abilities. Electrochemical properties were perceived by performing cyclic voltammetry and similar ionization potential values (5.09 eV), high enough for optoelectronic devices was obtained. Photophysical properties of the coumarin derivatives were observed by absorption and emission spectrometry. They revealed similar photophysical behaviour with fluorescence quantum yields of solid films in the range from 0.3 to 0.8. The materials synthesized showed solvatochromism, confirming intramolecular charge transfer in the structure. With an idea to extend the findings to practical application, a technological line was designed and proposed.
Dissertation Institution Kauno technologijos universitetas.
Type Master thesis
Language English
Publication date 2020