Zn2+-Doped CsPbI3/PVDF Composite Films with Enhanced Stability and Photoluminescence Quantum Yield for White-Light
Hai Huang1, Zijian Geng1, Ankang Wan1
1School of Materials Science and Engineering, Xiamen University of Technology, Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen 361024, China.
ACS Applied Materials & Interfaces
|November 21, 2025
Summary
Researchers developed stable red-emitting cesium lead iodide perovskite quantum dots (PQDs) using metal ion doping and ligand engineering. These enhanced PQDs achieve high photoluminescence quantum yield and enable wide color gamut white-light-emitting diodes (LEDs).
Area of Science:
- Materials Science
- Quantum Dot Technology
- Optoelectronics
Background:
- Cesium lead halide perovskite quantum dots (PQDs) are promising for displays due to excellent optoelectronic properties.
- Red-emitting CsPbI3 PQDs face stability issues from phase transitions, limiting LED applications.
- Achieving high photoluminescence quantum yield (PLQY) and stability in CsPbI3 PQDs remains a challenge.
Purpose of the Study:
- To develop stable red-emitting CsPbI3 PQDs with high PLQY for white-light LED applications.
- To overcome the environmental instability of CsPbI3 PQDs through synergistic optimization.
Main Methods:
- Employed a low-temperature in situ crystallization process.
- Implemented a synergistic strategy combining metal ion (Zn2+) doping and ligand engineering (phenethylammonium iodide - PEAI).
- Fabricated Zn2+-doped CsPbI3/PVDF composite films and integrated them into a dual-emissive-layer architecture.
Main Results:
- Surface ligand engineering with PEAI reduced defect density and enhanced luminescence.
- Optimized Zn2+ doping concentration yielded CsPbI3/PVDF films with 86% PLQY.
- A white-light-emitting device using the composite film achieved 121% NTSC and 91% Rec. 2020 color gamut with operational stability.
Conclusions:
- Synergistic optimization of Zn2+ doping and PEAI ligand engineering effectively stabilizes CsPbI3 PQDs.
- The developed PQDs show significant potential for high-performance white-light-emitting diode (LED) applications.
- This approach addresses key challenges in CsPbI3 PQD stability and performance for display technologies.
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