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Extending the Temperature and Time Operating Windows of CsPbI3 Quantum Dots for Scalable Synthesis for LEDs
Jianxun Wang1, Shuo Li1, Hongxin Tao1
1Key Laboratory of Automobile Materials MOE, School of Materials Science and Engineering, Jilin University, Changchun, P. R. China.
Angewandte Chemie (International Ed. in English)
|February 5, 2026
Summary
Phenylphosphonic acid (PPA) enables large-scale CsPbI₃ quantum dot (QD) synthesis by stabilizing colloidal systems and preventing phase transitions. This breakthrough extends the synthesis window, improving reproducibility and industrial viability for red perovskite QD devices.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Large-scale manufacturing of cesium lead iodide (CsPbI₃) quantum dots (QDs) faces challenges due to narrow operating windows, leading to performance issues.
- Ostwald ripening and phase transformations (α-to-δ) cause size variations and reproducibility problems in CsPbI₃ QD synthesis.
Purpose of the Study:
- To develop a method for extending the synthesis window of CsPbI₃ QDs for large-scale manufacturing.
- To improve the stability, performance, and reproducibility of CsPbI₃ QDs through a novel synthesis strategy.
Main Methods:
- Utilized phenylphosphonic acid (PPA) in a hot-injection method for CsPbI₃ QD synthesis.
- Investigated the synergistic effect of PPA's chelating and etching properties on colloidal stabilization and particle size control.
- Evaluated the impact of PPA on the thermal and temporal stability of the synthesis process.
Main Results:
- Extended the CsPbI₃ QD synthesis window from under 30 minutes to over 8 hours without phase transition.
- Achieved PPA-stabilized QDs with low Urbach energy (28.2 meV), high photoluminescence quantum yield (99.8%), and narrow emission bandwidth (34.5 nm).
- Demonstrated a peak external quantum efficiency of 30.7% in light-emitting devices fabricated with large-scale synthesized QDs.
Conclusions:
- Phenylphosphonic acid (PPA) offers a synergistic approach for stabilizing CsPbI₃ QDs, enhancing their industrial viability.
- The developed method significantly broadens the synthesis parameters, paving the way for scalable production of high-performance red perovskite QD inks and devices.
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