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Xing, Jun; Zhao, Yongbiao; Askerka, Mikhail; Quan, Li Na; Gong, Xiwen; Zhao, Weijie; Zhao, Jiaxin; Tan, Hairen; Long, Guankui; Gao, Liang; Yang, Zhenyu; Voznyy, Oleksandr; Tang, Jiang; Lu, Zheng-Hong; Xiong, Qihua; Sargent, Edward H
Nature communications, 08/2018, Letnik: 9, Številka: 1Journal Article
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 at 490 nm is achieved, fully one order of magnitude higher than the previous record for quasi-2D blue PeLEDs.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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