About this Biochemistry, Genetics and Molecular Biology article

Planar Defect–free Pure Red Perovskite Light-emitting Diodes via Metastable Phase Crystallization by Yong-Hui Song; Jing Ge; Li-Bo Mao; Kun-Hua Wang; Xiao-Lin Tai; Qian Zhang; Le Tang; Jing-Ming Hao; Ji-Song Yao; Jing-Jing Wang; Tao Ma; Jun-Nan Yang; Yi-Feng Lan; Xue-Chen Ru; Li-Zhe Feng; Guozhen Zhang; Yue Lin; Qun Zhang; Hong-Bin Yao is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

Solution-processable all-inorganic CsPbI ~3− x~ Br ~x~ perovskite holds great potential for pure red light-emitting diodes. However, the widely existing defects in this mixed halide perovskite markedly limit the efficiency and stability of present light-emitting diode devices. We here identify that intragrain Ruddlesden-Popper planar defects are primary forms of such defects in the CsPbI ~3− x~ Br ~x~ thin film owing to the lattice strain caused by inhomogeneous halogen ion distribution. To eliminate these defects, we develop a stepwise metastable phase crystallization strategy to minimize the CsPbI ~3− x~ Br ~x~ perovskite lattice strain, which brings planar defect–free CsPbI ~3− x~ Br ~x~ thin film with improved radiative recombination, narrowed emission band, and enhanced spectral stability. Using these high-quality thin films, we fabricate spectrally stable pure red perovskite light-emitting diodes, showing 17.8% external quantum efficiency and 9000 candela meter ^−2^ brightness with color coordinates required by Rec. 2020.

Author

Yong-Hui Song; Jing Ge; Li-Bo Mao; Kun-Hua Wang; Xiao-Lin Tai; Qian Zhang; Le Tang; Jing-Ming Hao; Ji-Song Yao; Jing-Jing Wang; Tao Ma; Jun-Nan Yang; Yi-Feng Lan; Xue-Chen Ru; Li-Zhe Feng; Guozhen Zhang; Yue Lin; Qun Zhang; Hong-Bin Yao

Publisher

American Association for the Advancement of Science (AAAS)

Published

2022

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Physical Sciences)