Author, Institution: M. Mahmoudi Sharabiani, Kaunas University of Technology
Science area, field of science: Technological Sciences, Materials Engineering, T008
Scientific Supervisor: Chief Researcher Dr. Dmytro Volyniuk (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Dissertation Defense Board of Materials Engineering Science Field:
Prof. Dr. Hab. Sigitas Tamulevičius (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008) – chairperson
Prof. Dr. Vladimir Dyakonov (Julius Maximilians University of Wurzburg, Germany, Natural Sciences, Physics, N002)
Chief Researcher Dr. Marius Franckevičius (Center for Physical Sciences and Technology, Natural Sciences, Physics, N002)
Prof. Dr. Hab. Arvaidas Galdikas (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Prof. Dr. Saulius Grigalevičius (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Dissertation defense meeting will be at Rectorate Hall of Kaunas University of Technology (K. Donelaičio 73 – 402, Kaunas)
The doctoral dissertation is available at the library of Kaunas University of Technology (Gedimino 50, Kaunas) and on the internet: M. Mahmoudi Sharabiani el. dissertation.pdf
Annotation: The aim of this work is the characterization of new blue fluorescent emitters for the development and fabrication of efficient OLEDs. 1. Efficient exciplex-based emitters exhibiting TADF with significant RISC rates up to 5.1 × 107 s-1 were designed based on new bicarbazole derivatives substituted by different electron donor moieties (fluoro- or trifluoromethyl). Their applicability was demonstrated for sensing the oxygen and hybrid solution-processable WOLEDs with high color rendering index. 2. The spatial exciton allocation strategy was first time used for WOLEDs based on TADF emitters. The strategy allowed modulation and separation of excitons and charges at the exciton recombination region and carrier recombination region resulting in ca. with twice higher EQE and higher quality of white color for developed OLEDs in comparison to the reference OLEDs. 3. Enhanced TADF efficiency and high reverse inter-system crossing rates from 4.7 × 104 to 2.32 × 106 s−1 were achieved for multicarbazolyl-substituted benzonitriles blue TADF emitters containing a variety of additional acceptors for efficient OLEDs with tunable color variations of blue electroluminescence. 4. The minimization of solid-state solvation and conformation disorder corollaries on the performance of blue TADF emitters by multi-donor-acceptor substitution engineering for doping-free and host-based OLEDs with unusually similar electroluminescent performances.
January 29 d. 11:00
Rectorate Hall at Kaunas University of Technology (K. Donelaičio 73 - 402, Kaunas)
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