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Ligand‐Mediated Synthesis of Mixed‐Phase Mn 2+ ‐Doped Cesium Lead Chloride Nanocrystals
Author(s) -
Xu Jie,
Liu Lijia
Publication year - 2021
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.202100096
Subject(s) - photoluminescence , oleylamine , nanocrystal , caesium , ligand (biochemistry) , luminescence , crystal structure , doping , band gap , chemistry , inorganic chemistry , materials science , photochemistry , crystallography , nanotechnology , optoelectronics , biochemistry , receptor
Herein we report a study on the role of alkylamine ligand in tuning the crystal structure and the luminescence of Mn 2+ ‐doped cesium lead chloride (Mn−CPC) nanocrystals. In a typical hot‐injection synthesis of Mn−CPC, oleic acid (OA) and oleylamine (OLA) are used as the capping ligands to mediate the size and surface structure of the nanocrystals. We found that by either increasing the concentration of OLA or substituting OLA with an amine with a shorter chain length (e. g. dodecylamine), the resulted Mn−CPC contains both CsPbCl 3 and Cs 4 PbCl 6 phases. The mixed‐phase Mn−CPC exhibit two major photoluminescence emission bands originated from the CsPbCl 3 bandgap and the Mn d‐d transition, respectively. Besides, a near‐UV emission from Cs 4 PbCl 6 near‐band‐gap exciton emission also appears and is highly sensitive to the excitation wavelength. The formation mechanism of mixed‐phase Mn−CPC nanocrystals is proposed.