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Updated: Jun 23, 2026
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Efficient and Stable Ligand-Exchange Process Using Perovskite Nanocrystals Synthesized from a Liquid Crystalline
Myeonggeun Han1, Taesu Choi1, Jun-Hyung Im1
1Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 37673, Republic of Korea.
ACS Nanoscience Au
|June 22, 2026
Summary
Liquid crystalline antisolvents enhance perovskite nanocrystal (PNC) ligand exchange, boosting efficiency and stability for optoelectronics. This method improves photoluminescence quantum yield and device performance, overcoming limitations of traditional toluene-based approaches.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Ligand exchange is crucial for perovskite nanocrystal (PNC) optoelectronics.
- Conventional methods often lead to instability and degradation of PNCs.
Purpose of the Study:
- To develop a more efficient and stable ligand-exchange process for PNCs.
- To investigate the use of liquid crystalline (LC) antisolvents in ligand-assisted reprecipitation (LARP).
Main Methods:
- Synthesizing PNCs using LC antisolvent (LC-LARP) and toluene (T-LARP).
- Performing ligand exchange on both LC-PNCs and T-PNCs.
- Characterizing photoluminescence quantum yield (PLQY) and stability.
Main Results:
- LC-LARP significantly improved PLQY (29% to 80%) compared to T-LARP (negligible improvement).
- LC-PNCs demonstrated exceptional stability, retaining over 50% PLQY at high ligand concentrations.
- LC-PNC-based LEDs achieved 8.2% external quantum efficiency, vastly outperforming T-PNC-based LEDs (0.5%).
Conclusions:
- LC-LARP offers a superior method for PNC ligand exchange, enhancing efficiency and stability.
- The approach is versatile across different ligands and perovskite compositions.
- This method enables high-performance perovskite nanocrystal-based optoelectronic devices.
