Mitigating surface structural disorder for high-performance near-infrared quantum dot light-emitting diodes
Jiawei Chen1, Xiyu Luo2, Xiangyu Liu2
1MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Science Advances
|July 17, 2026
Summary
Researchers developed novel perovskite quantum dots for near-infrared light-emitting diodes. A new additive significantly enhances device stability and performance, overcoming previous limitations.
Area of Science:
- Materials Science
- Quantum Dot Technology
- Optoelectronics
Background:
- Perovskite quantum dots (PQDs) show promise for near-infrared light-emitting diodes (NIR-LEDs).
- Device lifetime is limited by surface atomic disorder in PQDs.
- Existing methods struggle to mitigate surface defects effectively.
Purpose of the Study:
- To design and utilize a multifunctional additive to improve the surface structure of PQDs.
- To enhance the performance and operational stability of NIR-LEDs based on PQDs.
- To address the challenges of surface disorder and limited device lifetime in PQD-based optoelectronics.
Main Methods:
- Synthesized multifunctional zinc(II) 4-aminobenzenesulfonate as an additive.
- Applied the additive to mitigate surface structural disorder in PQDs.
- Fabricated and characterized NIR-LED devices using the modified PQDs.
Main Results:
- Achieved a photoluminescence quantum yield exceeding 90% due to mitigated surface disorder.
- Demonstrated NIR-LEDs with narrow electroluminescence spectra (42 nm FWHM at 789 nm).
- Obtained high external quantum efficiency (23.11%) with minimal efficiency roll-off (3% at 100 mA/cm²) and extended operating lifetime (2298 min at 1000 mW/sr/m²).
Conclusions:
- The multifunctional additive effectively strengthens surface atom termination and reduces disorder in PQDs.
- The developed PQDs enable high-performance NIR-LEDs with improved radiance, efficiency, and stability.
- This approach offers a significant advancement over previously reported PQD-based NIR-LEDs.
