Author, Institution: Ronit Sebastine Bernard, Kaunas University of Technology
Science area, field of science: Technological Sciences, Materials Engineering, T008
Scientific Supervisor: Dr. Viktorija Andrulevičienė (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008) (2020–2022)
Prof. Dr. Hab. Juozas Vidas Gražulevičius (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008) (2018–2020)
Scientific Advisor: Prof. Dr. Hab. Juozas Vidas Gražulevičius (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Dissertation Defence Board of Materials Engineering Science Field:
Prof. Dr. Hab. Arvaidas Galdikas (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008) – chairperson
Prof. Dr. Narine Durgaryan (Yerevan State University, Armenia, Natural Sciences, Chemistry, N003)
Prof. Dr. Saulius Grigalevičius (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Prof. Dr. Jolita Ostrauskaitė (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Prof. Dr. Valeriy Yashchuk (Taras Shevchenko National University of Kyiv, Ukraine, Natural Sciences, Physics, N002)
Dissertation defence meeting will be at M7 Hall at The Campus Library of Kaunas University of Technology (Studentų 48–M7, Kaunas)
The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas)
Annotation: The dissertation is devoted to the design, synthesis, and investigation of the properties of four novel series of electroactive materials. Synthesized triphenylethene-based derivatives exhibited aggregation induced emission enhancement, therefore, were used as fluorescent emitters in organic light emitting diodes (OLEDs). The highest external quantum efficiency (EQE) of 2% was observed for devices based on emitters containing 9,9-dimethyl-9,10-dihydroacridine moieties. The impact of the linking topology of the CF3 group has been investigated in new aromatic diamines. Compounds containing 2,5-bis(trifluoromethyl)benzene moieties exhibited interactions between the π system of the central phenyl ring and the fluorine atom resulting in the higher thermal temperatures, a lower ionization potential, and enhanced hole mobilities. In the third series, 3,6-dimethoxy-carbazole based monomers and polymers were synthesized. The relatively low polydispersity (Đ<1.5) and molecular weight up to 20,000 were estimated for the polymers. The obtained polymers were tested as hole-transporting materials and hosts in solution-processed OLEDs. The best phosphorescent device exhibited an external quantum efficiency of 10.6%. Five 9-(2-ethylhexyl)carbazole derivatives containing various donor fragments were investigated. The ionization potential values of the films of compounds were in range from 5.10 to 5.58 eV. These compounds were investigated as hosts in red phosphorescent OLEDs demonstrating maximum EQE of 12.61%
June 26 d. 12:00
M7 Hall at The Campus Library of Kaunas University of Technology (Studentų 48–M7, Kaunas)
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