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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
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A generic lanthanum doping strategy enabling efficient lead halide perovskite luminescence for backlights
Yongjie Liu1, Cheng Wang1, Guoyi Chen1
1Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China.
Science Bulletin
|May 1, 2023
Summary
Lanthanum ion doping significantly enhances metal halide perovskite films for displays. This strategy boosts photoluminescence quantum efficiency and stability, paving the way for commercialization in display technologies.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Chemistry
Background:
- Metal halide perovskite films offer solution-processed fabrication for advanced displays.
- Current limitations include suboptimal photoluminescence quantum efficiency (PLQE) and stability, hindering commercial viability.
Purpose of the Study:
- To enhance the luminescence performance and stability of metal halide perovskite films using lanthanum ion (La³⁺) doping.
- To explore the potential for commercialization of these improved perovskite films for display applications.
Main Methods:
- Lanthanum ion (La³⁺) doping was employed to modify the crystal structure and properties of perovskite films.
- Characterization of crystal quality, luminescence properties, stability under storage and light irradiation, and color gamut coverage was performed.
Main Results:
- La³⁺ doping improved crystal quality and formed a new phase, (FA, Cs)₂LaBr₅, facilitating energy transport.
- Achieved near-unity PLQE of 99.5% in FA₀.₇Cs₀.₃PbBr₃ perovskite films.
- Demonstrated enhanced stability with a 1000-day shelf-life half-lifetime and 400-hour light-irradiation T₉₀ lifetime.
- Attained 98.9% Rec. 2020 color gamut coverage for white light emission and trichromatic luminescence.
Conclusions:
- Lanthanum ion doping is an effective strategy to significantly improve the photoluminescence quantum efficiency, stability, and color purity of metal halide perovskite films.
- The enhanced properties suggest promising applications for La³⁺-doped perovskite films in liquid crystal display backlights and other optoelectronic devices.
