Researchers from North China Electric Power University, Beijing University of Chemical Technology and Sichuan Normal University have created bright blue perovskite LEDs (PeLEDs), among the LED colors needed to enable commercial applications.
With high efficiency and stability, PeLEDs could be a promising new option for full-color displays and solid-state lighting technology. However, while red and green PeLEDs have nearly reached their theoretical external quantum efficiencies, blue PeLEDs do not yet reach the efficiency, stability, or luminosity required for commercial applications. The novel method presented in this work seeks to address this challenge. Using an in situ spin-coating method, the authors created Dion-Jacobson phase quasi-2D perovskite nanocrystals. A mixture of mixed inorganic cesium bromide and two organic bidentate molecules in the perovskite precursor solution regulates growth and crosslinking in the nanocrystals. The resulting perovskites demonstrated effective emission in PeLEDs, brightly glowing from sky blue to deep blue.
“This study was important because it addressed critical challenges in the development of blue PeLEDs,” said author Zhan’ao Tan. “Successful implementation of this research could lead to more efficient, stable, and pure blue PeLEDs.”
The approach is said to be a simple and economically feasible one-step process, which could enable commercial applications.
“Looking ahead, this research has the potential to drive the commercialization of PeLEDs in display technologies and lighting applications,” Tan said. “Additionally, the insights gained from this work could inform further studies on the application of perovskite materials in other optoelectronic devices, potentially expanding their use in renewable and clean energy technologies.”
The authors intend to continue working on the PeLEDs to improve stability, particularly in real-life environments that have variable temperature and humidity.
