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Chemically Addressable Perovskite Nanocrystals for Light‐Emitting Applications
Author(s) -
Sun Haizhu,
Yang Zhenyu,
Wei Mingyang,
Sun Wei,
Li Xiyan,
Ye Shuyang,
Zhao Yongbiao,
Tan Hairen,
Kynaston Emily L.,
Schon Tyler B.,
Yan Han,
Lu ZhengHong,
Ozin Geoffrey A.,
Sargent Edward H.,
Seferos Dwight S.
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201701153
Subject(s) - materials science , passivation , perovskite (structure) , nanocrystal , photoluminescence , light emitting diode , nanotechnology , polymer , diode , optoelectronics , polymerization , chemical engineering , layer (electronics) , engineering , composite material
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 (MAPbBr 3 ) 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.