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Acridine Based Small Molecular Hole Transport Type Materials for Phosphorescent OLED Application
Ramanaskanda Braveenth1, Keunhwa Kim1, Il-Ji Bae2
1Division of Bio-Nanochemistry, College of Natural Sciences, Wonkwang University, Iksan 570-749, Jeonbuk, Korea.
Molecules (Basel, Switzerland)
|December 24, 2021
Summary
New small molecules, TPA-2ACR and PhCAR-2ACR, were synthesized for organic electronics. TPA-2ACR demonstrated superior performance as a hole-transporting material in OLEDs compared to TAPC.
Area of Science:
- Materials Science
- Organic Electronics
- Photochemistry
Background:
- Development of efficient organic light-emitting diodes (OLEDs) relies on advanced hole-transporting materials (HTMs).
- Acridine and carbazole derivatives are promising scaffolds for HTMs due to their electronic properties.
Purpose of the Study:
- To design and synthesize novel small molecular HTMs based on acridine and carbazole moieties.
- To evaluate the thermal stability and optoelectronic performance of the synthesized materials in OLED devices.
Main Methods:
- Single-step Buchwald-Hartwig amination for material synthesis.
- Thermal decomposition analysis (TGA) to assess thermal stability.
- Fabrication and characterization of OLED devices using synthesized materials.
Main Results:
- Two novel materials, TPA-2ACR and PhCAR-2ACR, were successfully synthesized.
- Both materials exhibited high thermal decomposition temperatures (>400 °C).
- TPA-2ACR achieved high efficiencies (55.74 cd/A, 29.28 lm/W, 21.59% EQE), outperforming the TAPC reference device.
- PhCAR-2ACR showed promise as a host material in phosphorescent OLEDs.
Conclusions:
- The synthesized acridine-based small molecules are effective HTMs for high-performance OLEDs.
- These materials offer improved efficiency and stability compared to conventional HTMs.
- Further investigation into PhCAR-2ACR as a host material is warranted.
