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

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

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-paircapped quantum dots exhibit high external quantum efficiencies compared with the untreated QDs.

Citation

Pan J, Quan LN, Zhao Y, Peng W, Murali B, et al. (2016) Highly Efficient Perovskite-Quantum-Dot Light-Emitting Diodes by Surface Engineering. Advanced Materials 28: 8718–8725. Available: http://dx.doi.org/10.1002/adma.201600784.

Sponsors

J.P., L.N.Q., and Y.Z. contributed equally to this work. This publication is based in part on Awards KUS-11-009-21 and URF/1/2268-01-01 made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. L. N. Quan and D. H. Kim acknowledge the financial support by the National Research Foundation of Korea Grant funded by the Korean Government (Grant No. 2014R1A2A1A09005656). The authors acknowledge Mrs. Nini Wei and Dr. Jun Li for TEM cross-sections.

Publisher

Wiley

Journal

Advanced Materials

ISSN

0935-9648