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Significantly Enhanced Emission Stability of CsPbBr3 Nanocrystals via Chemically Induced Fusion Growth for Optoelectronic Devices

Journal Article · · ACS Applied Nano Materials
Lead–halide perovskite nanocrystals (PNCs) have attracted much attention in recent years due to their outstanding optical properties. We report here a new chemical route for triggering postsynthetic growth of CsPbBr3 PNCs at room temperature via intentional depletion of stabilizing ligands, resulting in an immediate fusion growth of the as-synthesized PNCs. Upon fusion, the CsPbBr3 PNCs can grow from ca. 8 nm to ca. 60 nm in lateral dimensions in 48 h, reaching about 14 nm in thickness. More importantly, it was found that the fused PNCs have significantly enhanced optical properties. They showed an exceptionally higher stability to photodegradation. They also displayed sharper emission lines and a higher quantum yield, contrary to the fact that the nanocrystals are much larger. The much-improved optical properties are attributed to the Ruddlesden–Popper (RP) planar faults formed during the fusion process and observed using atomic resolution scanning transmission electron microscopy, which are predicted to result in quantum confinement based on density-functional theory calculations. The newly grown nanocrystals with RP defects are expected to significantly improve light emission properties of the PNCs and find applications in light-emitting diodes and other optoelectronic devices.
Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1493983
Journal Information:
ACS Applied Nano Materials, Journal Name: ACS Applied Nano Materials Journal Issue: 11 Vol. 1; ISSN 2574-0970
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate journal November 2019
Atomic Structure and Electrical Activity of Grain Boundaries and Ruddlesden-Popper Faults in Cesium Lead Bromide Perovskite journal December 2018
CsPbBr 3 Perovskite Quantum Dot Light‐Emitting Diodes Using Atomic Layer Deposited Al 2 O 3 and ZnO Interlayers journal October 2019
CsPbBr 3 Perovskite Quantum Dot Light‐Emitting Diodes Using Atomic Layer Deposited Al 2 O 3 and ZnO Interlayers journal November 2019
Fluorescence microscopy of single lead bromide nanocrystals reveals sharp transitions during their transformation to methylammonium lead bromide journal January 2019
Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate text January 2019

Figures / Tables (8)


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