Efficient AgInGaS-based QLEDs and full-color displays via uniform silver vacancy distribution
Tianchen Li1,2, Yuchen Yue1, Hui Li3
1Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Science Advances
|February 18, 2026
Summary
We developed a multistep temperature control strategy for silver indium gallium sulfide (AgInGaS) quantum dots (QDs), achieving uniform silver vacancy distribution and narrow emission for advanced display applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- AgInGaS (AIGS) quantum dots (QDs) offer narrow emission and tunable colors, making them ideal for display technologies.
- Nonuniform silver vacancy distribution in AIGS QDs leads to emission broadening, limiting device performance.
Purpose of the Study:
- To develop a precise temperature control strategy for uniform silver vacancy distribution in AIGS QDs.
- To enhance the optical properties and device performance of AIGS QDs for display applications.
Main Methods:
- A multistep temperature control strategy was employed to manage nucleation, cation exchange, and defect reconstruction.
- A dual-layer shell structure (AgGaS2/GaSx) was constructed to passivate surface defects.
- Interfacial confinement self-assembly was used to fabricate QD pixel arrays.
Main Results:
- Uniform silver vacancy distribution was achieved in AIGS QDs.
- Synthesized red, green, and blue AIGS QDs exhibited high photoluminescence quantum yields (up to 98.5%) and narrow FWHMs (down to 21 nm).
- QD light-emitting diodes demonstrated external quantum efficiencies of 13.2% (red), 8.0% (green), and 2.9% (blue).
- Full-color QD pixel arrays with resolutions up to 2032 pixels per inch were fabricated.
Conclusions:
- The developed strategy enables precise control over AIGS QD properties, overcoming limitations of vacancy distribution.
- The enhanced AIGS QDs and fabrication techniques show significant potential for high-performance near-eye display applications.
