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Updated: Jul 1, 2025
07:09
Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
2.1K
A chiral bipolar host for efficient solution-processed circularly polarized OLEDs via a chirality energy transfer
Qiwei Dong1,2, Binghong He1, Wenjian Qiao1,3
1Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science & Engineering, Changzhou University, Changzhou 213164, China. zhuwg18@126.com.
Chemical Communications (Cambridge, England)
|March 5, 2024
Summary
New chiral bipolar hosts enable circularly polarized luminescence in organic light-emitting diodes (CP-OLEDs). These hosts achieve high efficiency and strong circular polarization, paving the way for advanced display technologies.
Area of Science:
- Materials Science
- Organic Electronics
- Photophysics
Background:
- Chiral bipolar hosts are crucial for developing circularly polarized organic light-emitting diodes (CP-OLEDs).
- Achieving high energy levels and efficient circularly polarized luminescence (CPL) in host materials remains a challenge.
Purpose of the Study:
- To synthesize novel chiral bipolar host materials with high singlet/triplet energy levels.
- To investigate the potential of these hosts in solution-processable CP-OLEDs.
- To evaluate the electroluminescence performance and circular polarization properties.
Main Methods:
- Synthesis of chiral bipolar hosts, specifically (R/S)-L-2mCPCN.
- Fabrication of CP-OLEDs using these hosts with racemic phosphorescent and TADF emitters.
- Characterization of device performance, including maximum external quantum efficiency (EQEmax) and electroluminescence circular polarization (|gEL|).
Main Results:
- Successfully synthesized chiral bipolar hosts exhibiting high singlet/triplet energy levels and clear circularly polarized luminescence.
- Developed solution-processable CP-OLEDs demonstrating a maximum EQE of 10.7%.
- Achieved significant electroluminescence circular polarization with |gEL| values up to 5.0 × 10^-3.
Conclusions:
- The synthesized chiral bipolar hosts are effective for creating high-performance CP-OLEDs.
- Solution-processable CP-OLEDs based on these hosts show promising efficiency and circular polarization.
- This work contributes to the advancement of chiral materials for next-generation display and lighting applications.
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