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Aryl-substituted acridanes as hosts for TADF-based OLEDs
Naveen Masimukku1, Dalius Gudeika1, Oleksandr Bezvikonnyi1
1Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl. 19, LT-50254, Kaunas, Lithuania.
Beilstein Journal of Organic Chemistry
|June 9, 2020
Summary
New electroactive acridan derivatives were developed for organic light-emitting diodes (OLEDs). These materials exhibit high thermal stability and efficient performance in electroluminescent devices, achieving external quantum efficiencies up to 3.2%.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Organic light-emitting diodes (OLEDs) are crucial for modern display and lighting technologies.
- Developing efficient and stable electroactive materials is key to advancing OLED performance.
- Thermally activated delayed fluorescence (TADF) emitters offer a pathway to high efficiency in OLEDs.
Purpose of the Study:
- To design, synthesize, and characterize novel aryl-substituted acridan derivatives.
- To evaluate these derivatives as electroactive materials for OLED applications, particularly as hosts for TADF emitters.
- To investigate the thermal, electrochemical, and photophysical properties of the synthesized compounds.
Main Methods:
- Chemical synthesis of four aryl-substituted acridan derivatives.
- Characterization using techniques such as differential scanning calorimetry (DSC) and cyclic voltammetry.
- Fabrication and testing of electroluminescent devices incorporating the developed materials.
- Measurement of key parameters including glass-transition temperatures, oxidation potentials, ionization potentials, triplet energies, and charge carrier mobilities.
Main Results:
- Synthesized acridan derivatives exhibited high thermal stability (Tg: 79-97 °C).
- Compounds showed favorable electrochemical properties with oxidation potentials between 0.31-0.38 V and ionization potentials of 5.39-5.62 eV.
- Materials possessed triplet energies exceeding 2.5 eV.
- One derivative demonstrated high hole mobility (10^-3 cm^2/V·s).
- Electroluminescent devices utilizing these compounds as hosts achieved maximum external quantum efficiencies of up to 3.2%.
Conclusions:
- The designed aryl-substituted acridan derivatives are promising electroactive materials for OLEDs.
- Their high thermal stability and suitable electronic properties make them effective hosts for TADF emitters.
- The developed materials contribute to the advancement of efficient and stable organic electronic devices.
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