Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-05909-8
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Funding
- Singapore National Research Foundation [NRF-NRFI2015-03]
- Singapore National Research Foundation via the Competitive Research Programme [NRF-CRP14-2014-03]
- Singapore Ministry of Education through AcRF Tier 2 grant
- Singapore Ministry of Education through AcRF Tier 1 grant [MOE2015-T2-1-047, RG 113/16]
- US Department of the Navy, Office of Naval Research [N00014-17-1-2524]
- Ontario Research Fund-Research Excellence Program
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Netherlands Organisation for Scientific Research (NWO) [680-50-1511]
- Canada Foundation for Innovation under the Compute Canada
- Government of Ontario
- Ontario Research Fund-Research Excellence
- University of Toronto
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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.
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