Chemically Addressable Perovskite Nanocrystals for Light‐Emitting Applications |
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| Authors: | Haizhu Sun Zhenyu Yang Mingyang Wei Wei Sun Xiyan Li Shuyang Ye Yongbiao Zhao Hairen Tan Emily L Kynaston Tyler B Schon Han Yan Zheng‐Hong Lu Geoffrey A Ozin Edward H Sargent Dwight S Seferos |
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| Affiliation: | 1. Department of Chemistry, University of Toronto, Toronto, Ontario, Canada;2. College of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, P. R. China;3. The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada;4. Department of Materials Science and Engineering, University of Toronto, Toronto, Ontario, Canada |
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| 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. |
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| Keywords: | crosslinking reaction double bond modification light‐emitting diodes nanocrystals perovskites water resistant |
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