Author, Institution: Karolis Leitonas, Kaunas University of Technology
Science area, field of science: Technological Sciences, Materials Engineering, T008
Scientific Supervisor: Chief Researcher Dr. Hab. Dmytro Volyniuk (Kaunas University of Technology, Technological Sciences, Materials Engineering, T008)
Scientific Advisor: Senior Researcher Dr. Asta Dabulienė (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
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. 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)
Prof. Dr. Torma Paivi (Aalto University, Finland, Natural Sciences, Physics, N002)
Chief Researcher Dr. Gediminas Račiukaitis (State Research Institute Center for Physical Sciences and Technology, Natural Sciences, Physics, N002)
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: K. Leitonas el. dissertation (PDF)
Annotation: The study of organic semiconductors has got significant attention due to their unique potential and associated challenges. These materials, predominantly composed of carbon-based small molecules or polymers, exhibit distinct advantages over conventional inorganic semiconductors, including intrinsic flexibility, cost-efficient production processes, and solution-processability. Such characteristics position organic semiconductors as ideal candidates for applications in flexible displays, wearable electronics, and biodegradable sensors. A critical focus in this field lies in the efficient manipulation of excitons — electron-hole pairs within semiconductors, which is central to optimizing their performance in optoelectronic applications. Despite these advances, the effective utilization of excitons for light emission remains a fundamental challenge. Among the most promising approaches to address this issue is triplet harvesting, a technique that facilitates the conversion of non-emissive triplet excitons into emissive singlet excitons, thereby enhancing theoretical internal quantum efficiency (IQE) from 25% to nearly 100%. This dissertation systematically investigates three distinct triplet harvesting mechanisms: thermally activated delayed fluorescence (TADF), triplet-triplet annihilation (TTA), and hybridized local and charge-transfer excited states (HLCT). These mechanisms have been crucial in enabling organic light-emitting diodes (OLEDs) to achieve external quantum efficiencies exceeding 25%, marking a significant advancement in the field of organic optoelectronic devices.
February 7 d. 11:00
Rectorate Hall at Kaunas University of Technology (K. Donelaičio 73-402, Kaunas)
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