Highly Efficient Perovskite-Quantum-Dot Light-Emitting Diodes by Surface Engineering

Jun Pan; Li Na Quan; Yongbiao Zhao; Wei Peng; Banavoth Murali; Smritakshi P Sarmah; Mingjian Yuan; Lutfan Sinatra; Noktan M Alyami; Jiakai Liu; Emre Yassitepe; Zhenyu Yang; Oleksandr Voznyy; Riccardo Comin; Mohamed N Hedhili; Omar F Mohammed; Zheng Hong Lu; Dong Ha Kim; Edward H Sargent; Osman M Bakr

doi:10.1002/adma.201600784

Highly Efficient Perovskite-Quantum-Dot Light-Emitting Diodes by Surface Engineering

Adv Mater. 2016 Oct;28(39):8718-8725. doi: 10.1002/adma.201600784. Epub 2016 Aug 16.

Authors

Jun Pan¹, Li Na Quan^{2

3}, Yongbiao Zhao⁴, Wei Peng¹, Banavoth Murali¹, Smritakshi P Sarmah¹, Mingjian Yuan², Lutfan Sinatra¹, Noktan M Alyami¹, Jiakai Liu¹, Emre Yassitepe², Zhenyu Yang², Oleksandr Voznyy², Riccardo Comin², Mohamed N Hedhili⁵, Omar F Mohammed¹, Zheng Hong Lu⁴, Dong Ha Kim³, Edward H Sargent⁶, Osman M Bakr⁷

Affiliations

¹ Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia.
² Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.
³ Department of Chemistry and Nano Science, Ewha Woman's University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea.
⁴ Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario, M5S 3E4, Canada.
⁵ Imaging and Characterization Laboratory, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia.
⁶ Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada. ted.sargent@utoronto.ca.
⁷ Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Kingdom of Saudi Arabia. osman.bakr@kaust.edu.sa.

PMID: 27529532
DOI: 10.1002/adma.201600784

Abstract

A two-step ligand-exchange strategy is developed, in which the long-carbon- chain ligands on all-inorganic perovskite (CsPbX₃ , X = Br, Cl) quantum dots (QDs) are replaced with halide-ion-pair ligands. Green and blue light-emitting diodes made from the halide-ion-pair-capped quantum dots exhibit high external quantum efficiencies compared with the untreated QDs.

Keywords: CsPbBr3; external quantum efficiency; light-emitting diodes; perovskite; quantum dots.