Highly Emissive Green Perovskite Nanocrystals in a Solid State Crystalline Matrix. Issue 21 (29th March 2017)

• Record Type: Journal Article
• Authors: Quan, Li Na; Quintero‐Bermudez, Rafael; Voznyy, Oleksandr; Walters, Grant; Jain, Ankit; Fan, James Zhangming; Zheng, Xueli; Yang, Zhenyu; Sargent, Edward H.
• Is Part Of: Advanced materials. Volume 29:Issue 21(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-03-29
• Subjects: cesium–lead halide perovskites -- inorganic halide perovskites -- endotaxy -- nanocrystals; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201605945
• Languages: English
• ISSNs: 0935-9648

Abstract

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 (Cs4 PbBr6 ) 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. Abstract : Solution‐phase synthesis of efficient green‐emitting perovskite nanocrystal (NC) inclusions in rhombic prism microcrystals is presented. A theoretical model is built on the basis of experimental characterization of the material and further justified by means of density functional theory simulations. The potential of lattice‐matching between the NCs and the matrix strongly improves the interface, leading to high performance metrics in the solid‐state.