Molecule-induced ripening control in perovskite quantum dots for efficient and stable light-emitting diodes
Jiawei Chen1, Shulin Chen2, Xiangyu Liu1
1Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
Science Advances
|March 14, 2025
Summary
Researchers stabilized perovskite quantum dots (QDs) using a bidentate molecule, preventing degradation and enhancing device performance. This method significantly improved the stability and efficiency of QD-based light-emitting diodes (LEDs).
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Perovskite quantum dots (QDs) are promising for optoelectronic devices.
- Ligand loss during processing causes QD aggregation and performance issues.
Purpose of the Study:
- To enhance the stability and performance of CsPbI3 quantum dots (QDs).
- To mitigate aggregation and defect generation in QDs using a bidentate molecule.
Main Methods:
- Utilized a bidentate molecule to control ripening in CsPbI3 QDs.
- Investigated the interaction between QDs and the bidentate molecule.
- Fabricated QD-based light-emitting diodes (LEDs).
Main Results:
- Achieved a maximum external quantum efficiency (EQE) of 26.0% at 686 nm.
- Demonstrated an operating half-life of 10,587 hours for QD-based LEDs.
- QD solutions stored for 3 months maintained high EQE (20.3%).
Conclusions:
- Bidentate molecules effectively stabilize QDs, preventing ripening and defects.
- The stabilized QDs lead to high-performance and long-lasting QD-based LEDs.
- This approach offers a pathway for robust perovskite quantum dot optoelectronics.
