Third generation OLED emitter are moving away from organic materials with heavy metals to fully organic materials, exhibiting thermally activated delayed fluorescence (TADF). Similar to phosphorescence OLEDS, TADF OLEDs also can reach 100 % internal quantum efficiency (IQE), which can be achieved by incorporating reverse intersystem crossing (RISC). At this moment most developed strategy to achieve effective small molecule TADF emitter is to make TADF emitters from to main structural parts, of which one is distinguished by electron donating and other part by electron accepting properties. In these molecules TADF effect occurs, because of strongly localised molecular orbitals in donor and acceptor parts, which leads to effective charge transfer in excited state and small gap between singlet and triplet state, which allows RISC to happen. If different donor fragments are used, asymmetrical TADF structures can be made. The main goal of this project is to measure new asymmetrical TADF emitters photophysical properties and apply to OLED development.
Project funding:
Project is funded by EU Structural Funds according to the 2014–2020 Operational Programme for the European Union Funds’ Investments priority “Development of scientific competence of researchers, other researchers, students through practical scientific activities” under Measure No. 09.3.3-LMT-K-712.
Project results:
Investigated asymetrical TADF emitters photophysical properties by using spectroscopic methods, emitters tested by incorporating into matrix, OLED devices formed by using vacuum deposition
Period of project implementation: 2019-07-01 - 2019-08-31
Project coordinator: Kaunas University of Technology
