High-performance and stable CsPbBr3 light-emitting diodes based on polymer additive treatment
Wanqing Cai1, Ziming Chen1, Dongcheng Chen1
1State Key Laboratory of Luminescent Materials and Devices, Institute of Polymer Optoelectronic Materials and Devices, School of Materials Science and Engineering, South China University of Technology 381 Wushan Road Guangzhou 510640 P. R. China mszimingchen@yahoo.com msangusyip@scut.edu.cn.
RSC Advances
|May 9, 2022
Summary
Highly stable perovskite light-emitting diodes (PeLEDs) were developed using a simple polymer treatment. This breakthrough enhances the efficiency and photoluminescence of CsPbBr3 nanocrystals, paving the way for next-generation lighting.
Area of Science:
- Materials Science
- Optoelectronics
- Solid-State Physics
Background:
- Perovskite light-emitting diodes (PeLEDs) offer high efficiency and sharp emission, making them promising for next-generation lighting.
- However, poor stability of current PeLEDs limits their commercial viability and widespread application.
- Developing highly stable PeLEDs is crucial to meet market demands and unlock their full potential.
Purpose of the Study:
- To develop a highly stable perovskite light-emitting diode (PeLED) suitable for commercial applications.
- To investigate the effect of polymer treatment on the stability and performance of CsPbBr3-based PeLEDs.
- To enhance the quality and photoluminescence properties of perovskite films for improved device performance.
Main Methods:
- Fabrication of CsPbBr3 perovskite films treated with 2-methyl-2-oxazoline polymer.
- Formation of CsPbBr3 nanocrystals within a polymer matrix to improve film quality.
- Characterization of the structural, optical, and electroluminescent properties of the hybrid films and devices.
Main Results:
- The polymer treatment facilitated the formation of high-quality CsPbBr3 nanocrystals, enhancing film properties.
- The resulting perovskite light-emitting diode (PeLED) exhibited high external quantum efficiency (3.0%) and luminance (16,648 cd m⁻²).
- An excellent device half-lifetime exceeding 2.4 hours was achieved under continuous operation at a high initial luminance of 1000 cd m⁻².
Conclusions:
- Simple polymer treatment significantly enhances the stability of CsPbBr3-based PeLEDs.
- The developed hybrid nanocrystal-polymer film strategy offers a viable route to highly stable and efficient PeLEDs.
- These findings represent a significant advancement in overcoming stability limitations for practical perovskite lighting applications.
