Publication date: 18th August 2023
Organic luminescent materials that can effectively harvest triplet excitons are advantageous for numerous applications including OLED displays, chemical sensors and as bioimaging agents. The two main strategies to utilize triplet excitons are thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP). Therefore, attention has been drawn to the design and synthesis of various emissive donor–acceptor (D - A) type organic compounds.
In this work, aiming to develop efficient materials for emitters exhibiting delayed fluorescence, donor-acceptor type quinoxaline-based derivatives were designed, synthesized and characterized by different theoretical and experimental techniques. The quinoxaline unit was chosen as acceptor core due to high electron affinities and strong electron-accepting properties because of two sp2-hybridized nitrogen atoms (aromatic C=N) in the structure. Different electron donating moieties were chosen to determine the structure-properties relationship. It was determined that the process of excitation recombination is controlled by changing the polarity of the electron donating moieties. The delayed fluorescence originates from single molecules embedded into rigid polymer matrix and after deoxygenation.
This project has received funding from the Research Council of Lithuania (LMTLT), agreement No. S-PD-22-83.
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