title: Highly Emissive Green Perovskite Nanocrystals in a Solid State Crystalline Matrix.
abstract: 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 (CsPbBr3) embedded in robust and air-stable rhombic prism hexabromide (Cs4PbBr6) 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.
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: Li Na
authors.initials: LN
authors.lastname: Quan
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: Rafael
authors.initials: R
authors.lastname: Quintero-Bermudez
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: Oleksandr
authors.initials: O
authors.lastname: Voznyy
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: Grant
authors.initials: G
authors.lastname: Walters
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: Ankit
authors.initials: A
authors.lastname: Jain
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: James Zhangming
authors.initials: JZ
authors.lastname: Fan
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: Xueli
authors.initials: X
authors.lastname: Zheng
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario, M5S 1A4, Canada.
authors.forename: Edward H
authors.initials: EH
authors.lastname: Sargent
keywords: cesium-lead halide perovskites; endotaxy; inorganic halide perovskites; nanocrystals