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Highly Emissive Green Perovskite Nanocrystals in a Solid State Crystalline Matrix
Author(s) -
Quan Li Na,
QuinteroBermudez Rafael,
Voznyy Oleksandr,
Walters Grant,
Jain Ankit,
Fan James Zhangming,
Zheng Xueli,
Yang Zhenyu,
Sargent Edward H.
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.201605945
Subject(s) - materials science , photoluminescence , perovskite (structure) , nanocrystal , quantum yield , passivation , optoelectronics , nanotechnology , chemical engineering , optics , fluorescence , physics , layer (electronics) , engineering
Perovskite nanocrystals (NCs) have attracted attention due to their high photoluminescence quantum yield (PLQY) in solution; however, maintaining high emission efficiency in the solid state remains a challenge. This study presents a solution‐phase synthesis of efficient green‐emitting perovskite NCs (CsPbBr 3 ) embedded in robust and air‐stable rhombic prism hexabromide (Cs 4 PbBr 6 ) microcrystals, reaching a PLQY of 90%. Theoretical modeling and experimental characterization suggest that lattice matching between the NCs and the matrix contribute to improved passivation, while spatial confinement enhances the radiative rate of the NCs. In addition, dispersing the NCs in a matrix prevents agglomeration, which explains their high PLQY.