Color-stable highly luminescent sky-blue perovskite light-emitting diodes

Jun Xing, Yongbiao Zhao, Mikhail Askerka, Li Na Quan, Xiwen Gong, Weijie Zhao, Jiaxin Zhao, Hairen Tan, Guankui Long, Liang Gao, Zhenyu Yang, Oleksandr Voznyy, Jiang Tang, Zheng-Hong Lu (), Qihua Xiong () and Edward H. Sargent ()
Additional contact information
Jun Xing: Nanyang Technological University
Yongbiao Zhao: University of Toronto
Mikhail Askerka: University of Toronto
Li Na Quan: University of Toronto
Xiwen Gong: University of Toronto
Weijie Zhao: Nanyang Technological University
Jiaxin Zhao: Nanyang Technological University
Hairen Tan: University of Toronto
Guankui Long: University of Toronto
Liang Gao: University of Toronto
Zhenyu Yang: University of Toronto
Oleksandr Voznyy: University of Toronto
Jiang Tang: Huazhong University of Science and Technology (HUST)
Zheng-Hong Lu: University of Toronto
Qihua Xiong: Nanyang Technological University
Edward H. Sargent: University of Toronto

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Perovskite light-emitting diodes (PeLEDs) have shown excellent performance in the green and near-infrared spectral regions, with high color purity, efficiency, and brightness. In order to shift the emission wavelength to the blue, compositional engineering (anion mixing) and quantum-confinement engineering (reduced-dimensionality) have been employed. Unfortunately, LED emission profiles shift with increasing driving voltages due to either phase separation or the coexistence of multiple crystal domains. Here we report color-stable sky-blue PeLEDs achieved by enhancing the phase monodispersity of quasi-2D perovskite thin films. We selected cation combinations that modulate the crystallization and layer thickness distribution of the domains. The perovskite films show a record photoluminescence quantum yield of 88% at 477 nm. The corresponding PeLEDs exhibit stable sky-blue emission under high operation voltages. A maximum luminance of 2480 cd m−2 at 490 nm is achieved, fully one order of magnitude higher than the previous record for quasi-2D blue PeLEDs.

Date: 2018
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DOI: 10.1038/s41467-018-05909-8

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