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Updated: Mar 13, 2026
Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Solution-processed highly bright and durable cesium lead halide perovskite light-emitting diodes
Zhanhua Wei1, Ajay Perumal2, Rui Su3
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore. qihua@ntu.edu.sg and College of Materials Science & Engineering, Huaqiao University, Xiamen, Fujian, 361021 China. weizhanhua@hqu.edu.cn.
Highly bright and durable cesium lead bromide (CsPbBr3) perovskite LEDs were fabricated using a one-step solution method with a CsBr additive. This additive enhances performance and stability, overcoming previous limitations in perovskite light-emitting diodes (LEDs).
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Cesium lead bromide (CsPbBr3) perovskites show promise for green light-emitting diodes (LEDs) due to high color purity and photoluminescence quantum yield (PLQY).
- Current CsPbBr3 LED performance is limited by suboptimal film preparation and interfacial engineering, lagging behind other perovskite materials.
Purpose of the Study:
- To develop highly bright and durable CsPbBr3-based LEDs.
- To improve perovskite film quality and LED performance through a novel fabrication method.
Main Methods:
- A one-step solution method was employed, dissolving CsPbBr3 powder and a cesium bromide (CsBr) additive in dimethyl sulfoxide (DMSO).
- The CsBr additive was investigated for its effect on PLQY, crystal growth, and film morphology.
- Fabricated LEDs were tested for luminance, color purity, and ambient stability under constant current density.
Main Results:
- The CsBr additive significantly enhanced PLQY and induced directional crystal growth into micro-plates, forming smooth perovskite films.
- LEDs achieved high luminance (7276 cd m⁻²) and excellent color purity (18 nm FWHM).
- The devices demonstrated outstanding ambient stability, maintaining luminance (>100 cd m⁻²) for over 15 hours, with a unique luminance-increasing behavior attributed to thermal stability and annealing effects.
Conclusions:
- A facile one-step solution method utilizing a CsBr additive enables the fabrication of high-performance CsPbBr3 perovskite films for LEDs.
- The optimized films lead to highly bright, color-pure, and remarkably stable LEDs with unique self-enhancing luminance characteristics.
- This approach addresses key challenges in CsPbBr3 perovskite LED development, paving the way for advanced optoelectronic applications.
