Blue perovskite LEDs improved with in situ fabrication technique

With high efficiency and stability, perovskite light-emitting diodes (PeLEDs) could be a promising new option for full-color displays and solid-state lighting technology. But, while red and green PeLEDs have nearly reached their theoretical external quantum efficiencies, blue PeLEDs do not yet have the efficiency, stability, or luminosity required for commercial applications.

That could change with a novel method presented by Wang et al. 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 authors are most excited about the 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.

Source: “In-situ fabrication of perovskite nanocrystals with Dion-Jacobson phase for high-performance blue light-emitting diodes,” by Yang Wang, Xiaodong Zhu, Haoran Jia, Donghui Xu, Xiangyang Liu, Yiming Bai, Xingming Bian, Fuzhi Wang, Meicheng Li, and Zhan’ao Tan, Applied Physics Reviews (2024). The article can be accessed at https://doi.org/10.1063/5.0200866 .