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Ligand-Assisted Purification of Mixed-Halide Perovskite Nanocrystals with Near-Unity PLQY for High-Color-Purity
Stephy Jose1,2, Joo Yeon Kim1,2, Hyunsu Cho3
1Regional ICT Convergence Research Section, Greater Seoul Research Division, Electronics and Telecommunications Research Institute (ETRI), Seongnam-si 13488, Republic of Korea.
Materials (Basel, Switzerland)
|November 13, 2025
Summary
Researchers optimized purification for perovskite nanocrystals (PNCs) used in displays. Post-synthetic ligand addition enhances surface passivation, preserving optical properties for vibrant, high-purity color displays.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Cesium halide perovskite nanocrystals (PNCs) offer excellent optoelectronic properties for displays.
- Purification challenges include ligand detachment, leading to defects and reduced performance.
- Anti-solvent choice critically impacts PNC stability and ligand retention.
Purpose of the Study:
- To develop an optimized purification strategy for mixed-halide PNCs.
- To maintain structural and optical integrity during PNC purification.
- To enhance color purity and quantum efficiency for display applications.
Main Methods:
- Implemented post-synthetic ligand supplementation with sequential oleic acid (OA) and oleylamine (OAm) addition.
- Introduced OA and OAm prior to anti-solvent treatment.
- Analyzed the impact of ligand supplementation on surface passivation and defect states.
Main Results:
- Achieved near-unity photoluminescence quantum yield (PLQY) for green- and red-emissive PNCs.
- Obtained narrow full-width-at-half-maximum (FWHM) emissions, indicating enhanced color purity.
- Demonstrated suppressed trap state formation and minimized halide loss.
Conclusions:
- Optimized purification strategy using post-synthetic ligand supplementation significantly improves PNC quality.
- This method preserves optoelectronic properties, crucial for high-performance display technologies.
- Provides a viable pathway for next-generation wide-color-gamut displays.
