Electron confinement-enhanced green InP-based quantum dots for active-matrix LEDs displays
Ning Guo1,2,3, Ke He1,2,3, Hui Li4
1Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China.
Nature Communications
|February 27, 2026
Summary
Researchers developed cadmium-free quantum dots for displays. A new surface treatment enhances electron confinement, boosting performance and lifetime for quantum dot light-emitting diodes and enabling high-resolution displays.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Facet-selective shell growth on InP quantum dots limits electron confinement.
- This challenge hinders the development of cadmium-free quantum dot light-emitting diode (QD-LED) displays.
Purpose of the Study:
- To improve electron confinement in InP/ZnSe/ZnS quantum dots.
- To enhance the performance and stability of QD-LEDs.
- To achieve high-resolution quantum dot arrays for advanced displays.
Main Methods:
- Developed a surface energy homogenization strategy using n-octylamine and diphenylphosphine selenide ligands.
- Suppressed selective ZnSe growth on the InP (111) facet.
- Employed an asymmetric wettability-mediated assembly strategy for quantum dot array fabrication.
Main Results:
- Achieved strongly electron-confined InP/ZnSe/ZnS quantum dots with >92% quantum yield and 35 nm FWHM.
- Demonstrated QD-LEDs with 23.50% external quantum efficiency and >1.4 × 10^5 cd/m^2 luminance.
- Reported a 107.5-fold increase in device lifetime and quantum dot arrays with 8460 PPI resolution.
Conclusions:
- The surface energy homogenization strategy effectively enhances electron confinement in InP-based quantum dots.
- The developed quantum dots and assembly methods pave the way for high-performance, cadmium-free QD-LED displays.
- Successful demonstration of static and dynamic image display using integrated QD-LEDs validates the technology.
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