Author, Institution: Uliana Tsiko, Kaunas University of Technology
Science area, field of science: Technological Sciences, Chemical Engineering, T005
Scientific Supervisor: Prof. Dr. Hab. Juozas Vidas Gražulevičius (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
Scientific Advisor: Dr. Rasa Keruckienė (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Dissertation Defense Board of Chemical Engineering Science Field:
Prof. Dr. Rimantas Venskutonis (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005) – chairperson
Prof. Dr. Rasa Pauliukaitė (State research institute Center for Physical Sciences and Technology, Natural Sciences, Physics, N002)
Prof. Dr. Ramunė Rutkaitė (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
Prof. Dr. Virgilijus Valeika (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
Prof. Dr. Valeriy Yashchuk (Taras Shevchenko National University of Kyiv, Ukraine, Natural Sciences, Physics, N002)
The dissertation defence was at the Meeting room at Santaka Valley of Kaunas University of Technology (K. Baršausko 59 – A228, Kaunas)
The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas)
Annotation:
The evolution of organic light-emitting compounds is a prerequisite for the development of highly efficient organic luminescent devices. To obtain the emitters with the special properties the careful selection of donor and acceptor units has to be done. The thesis is devoted to the synthesis and investigation of properties of new light-emitting donor-acceptor derivatives containing benzanthrone or pyrimidine-5-carbonitrile moieties for the application in organic light-emitting diodes (OLEDs) and oxygen sensors. The effect of donor strength on photophysical, electrochemical and thermal properties of the synthesized materials was investigated. Carbozole- and benzantrone-based materials exhebited mechanochromic luminiscence. Phenothiazinyl or phenoxazinyl-substituted benzanthrones were characterized as promosing candidates for oxygen sensing. New emitters containing pyrimidine-5-carbonitrile moiety as acceptor and carbazolyl and tret-butyl carbazolyl groups as donors were developed. They exhibited thermally activated delayed fluorescence Their applicability for the fabrication of efficient sky-blue OLEDs and oxygen sensors was demonstrated. Triphenylamino or 9-phenyl carbazolyl substituted pyrimidine-5-carbonitriles were synthesized for the first time and utilized as emitters for blue and green fluorescent OLEDs and as hosts for efficient orange-red OLEDs based on thermally activated delayed fluorescence. External quantum efficiency of the devices exceeded of 20%.
September 13 d. 10:00
Meeting room at Santaka Valley of Kaunas University of Technology (K. Baršausko 59 – A228, Kaunas)
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