Abstract
Whereas organic–inorganic hybrid perovskite nanocrystals (PNCs) have remarkable potential in the development of optoelectronic materials, their relatively poor chemical and colloidal stability undermines their performance in optoelectronic devices. Herein, this issue is addressed by passivating PNCs with a class of chemically addressable ligands. The robust ligands effectively protect the PNC surfaces, enhance PNC solution processability, and can be chemically addressed by thermally induced crosslinking or radical-induced polymerization. This thin polymer shield further enhances the photoluminescence quantum yields by removing surface trap states. Crosslinked methylammonium lead bromide (MAPbBr3) PNCs are applied as active materials to build light-emitting diodes that have low turn-on voltages and achieve a record luminance of over 7000 cd m−2, around threefold better than previous reported MA-based PNC devices. These results indicate the great potential of this ligand passivation approach for long lifespan, highly efficient PNC light emitters.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1701153 |
| Journal | Advanced Materials |
| Volume | 29 |
| Issue number | 34 |
| DOIs | |
| State | Published - Jul 10 2017 |
| Externally published | Yes |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledged KAUST grant number(s): KUS-11-009-21
Acknowledgements: H.S. and Z.Y. contributed equally to this work. This work was supported by the Ontario Research Fund Research Excellence Program, the Natural Sciences and Engineering Research Council (NSERC) of Canada, the Canadian Foundation for Innovation, DuPont, an award (KUS-11-009-21) from the King Abdullah University of Science and Technology (KAUST), and the A. P. Sloan Foundation. H.S. acknowledges the support of National Natural Science Foundation of China (NSFC) (21574018 and 51433003) and China Scholarship Council (CSC). W.S. and G.A.O. acknowledge the support of Connaught Innovation Fund and Connaught Global Challenge Fund. H.T. acknowledges the Netherlands Organisation for Scientific Research (NWO) for a Rubicon grant (680-50-1511) to support his postdoctoral research at University of Toronto. The authors appreciate the valuable suggestions of N. Coombs and I. Gourevich for the TEM and HRTEM measurement. The authors thank Dr. F. Fan, Dr. M. Liu, Dr. L. Levina, E. Palmiano, and D. Kopilovic for their help during the course of the study.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.