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Cooperative chelation for high-performance Perovskite light-emitting diodes.
Rui Li1, Chunru Fan2, Min Lu3,4
1State Key Laboratory of Integrated Optoelectronics, JLU Region, College of Electronic Science and Engineering, Jilin University, Changchun, PR China.
Nature Communications
|June 20, 2026
Summary
A dual additive system using 5-aminopentanoic acid and (4-fluoropheny)thiourea significantly enhances perovskite light-emitting diodes (PeLEDs) by passivating multiple crystal defects, boosting efficiency and stability for commercial viability.
Area of Science:
- Materials Science
- Optoelectronics
- Chemistry
Background:
- Molecular additives are crucial for improving perovskite light-emitting diode (PeLED) performance via defect passivation.
- Current single additives struggle to address the multiple lattice planes and defects present in nanocrystallites.
Purpose of the Study:
- To develop and evaluate a dual additive system for enhanced FAPbI3 PeLED performance.
- To investigate the synergistic effects of 5-aminopentanoic acid and (4-fluoropheny)thiourea on crystal growth and defect passivation.
Main Methods:
- A dual additive system comprising 5-aminopentanoic acid and (4-fluoropheny)thiourea was synthesized and applied to FAPbI3 PeLEDs.
- Computational analysis and experimental characterization were used to understand additive-defect interactions and film morphology.
Main Results:
- The dual additives cooperatively passivated defective sites across (100), (110), and (111) lattice planes, outperforming single additives.
- This synergistic passivation led to smaller, uniform crystal grains, smoother thin films, higher exciton binding energy, and improved luminescence quantum yields.
- The optimized PeLEDs achieved a peak external quantum efficiency (EQE) of 26.3% and high radiance (1843 W·sr−1·m−2).
Conclusions:
- Dual additive systems offer a superior strategy for defect passivation in PeLEDs compared to single additives.
- The enhanced performance and stability suggest potential for commercial application of these PeLEDs.
