Electroactive organic emitters receive considerable attention due to their potential application in lighting, display and sensor technologies. Efficient electroactive organic emitters must be developed and synthesized in order to develop organic light emitting diodes (OLEDs) with high efficiency and durability. For the successful use of such materials in OLEDs and other optoelectronic devices, it is necessary to determine the nature and efficiency of emission, charge-transporting properties, thermal and photochemical stability. Triplet empowerment has been shown to increase external quantum efficiency of OLEDs, and therefore materials with thermally activated (TADF) are of great interest. Materials exhibiting room temperature phosphorescence (RTP) are recently widely studied as potential materials for oxygen sensing applications. Efficient triplet conversion in TADF / RTP materials is achieved by using donor and acceptor molecular moieties within the same molecular structure. The aim of this project is the synthesis and study of properties of new metal-free emitters containing donor-acceptor moieties. The search for efficient TADF / RTP materials remains relevant in order to better understand the trends in the dependence of properties of materials on their structure and to estimate their applicability in OLEDs and sensors.
Project funding:
This research project is funded by the European Social Fund according to the 2014–2020 Operational Programme for the European Union Funds’ Investments, under measure’s No. 09.3.3-LMT-K-712 activity “Promotion of postdoctoral fellowships studies”.
Project results:
The main contributions of this research project are the development of:
– new efficient donor-acceptor TADF materials for electroluminescent devices (PLQY in solid state >60%, PL decays in ?s range; glass transition temperatures above 100 °C);
– new RTP materials with long wmission life times (in miliseconds range) and with high ratios of intensities (>10) of RTP to fluorescence for oxygen sensors
– effective OLEDs (max. current efficiency exceeding 40 cd/A; max. power efficiency exceeding30 lm/W; max. external quantum efficiency exceeding15 %) which will be based on new D-A TADF materials.
Period of project implementation: 2020-08-11 - 2022-08-10
Project coordinator: Kaunas University of Technology
