Cai Zhihao et al. AM: Over 10% Efficiency! Highly Stable Blue Perovskite Light-Emitting Diodes
Release Date:
2020-11-24 15:22
Source:
Although numerous studies have been conducted to tune the quasi-2D perovskite composition in perovskite light-emitting diodes (PeLEDs) to enhance their electroluminescence, few reports have addressed strategies for enhancing energy transfer between the quasi-2D perovskite layers in the thin film—a critical factor for achieving high-performance PeLEDs.
In light of this, Zhihao Cai from the University of Hong Kong and Kai Wang, Rui Chen, and their colleagues at the Southern University of Science and Technology have, for the first time, introduced a bifunctional ligand—4-(2-aminoethyl)benzoic acid (ABA) cations—into perovskite materials to reduce the weak van der Waals gaps between perovskite layers, thereby promoting the coupling of quasi-two-dimensional perovskite layers.
The enhanced interlayer interactions among coupled quasi-2D perovskite layers facilitate efficient energy transfer within the perovskite film. Moreover, the introduced ABA layer can passivate perovskite defects by reducing metallic Pb, thereby minimizing non-radiative recombination losses.
Thanks to the improved quality of perovskite films doped with ABA, researchers have fabricated blue-emitting quasi-2D PeLEDs with an external quantum efficiency as high as 10.11% and a operational stability of 81.3 minutes.
Therefore, this work provides an effective approach for advancing high-performance and stable blue PeLEDs toward practical applications.
Zhenwei Ren et al., High-Performance Blue Perovskite Light-Emitting Diodes Enabled by Efficient Energy Transfer between Coupled Quasi-2D Perovskite Layers, Advanced Materials, 2020.
DOI: 10.1002/adma.202005570
https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202005570
Related News