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Phase Regulation Strategy of Perovskite Nanocrystals from 1D Orthomorphic NH 4 PbI 3 to 3D Cubic (NH 4 ) 0.5 Cs 0.5 Pb(I 0.5 Br 0.5 ) 3 Phase Enhances Photoluminescence
Author(s) -
Wang Chao,
Liu Yue,
Feng Xia,
Zhou Chenyang,
Liu Yalan,
Yu Xi,
Zhao Guangjiu
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201903121
Subject(s) - photoluminescence , nanocrystal , materials science , perovskite (structure) , ammonium bromide , ion , crystal structure , bromide , phase (matter) , absorption spectroscopy , spectroscopy , halogen , crystallography , inorganic chemistry , nanotechnology , chemistry , optoelectronics , optics , organic chemistry , pulmonary surfactant , biochemistry , physics , alkyl , quantum mechanics
This work reports this first synthesis of 1D orthomorphic NH 4 PbI 3 perovskite nanocrystals (NCs) considering the role of inorganic ammonium ions at the nanoscale. The addition of bromide ions at the halogen site did not improve the photoluminescence properties. Furthermore, the 3D cubic phase of (NH 4 ) 0.5 Cs 0.5 Pb(I 0.5 Br 0.5 ) 3 NCs with bright photoluminescence was synthesized by adding Cs ions into the crystal lattice of (NH 4 )Pb(I 0.5 Br 0.5 ) 3 . Moreover, the photophysical properties of different phase structures were studied using femtosecond transient absorption (FTA) spectroscopy. The ultrafast trap state capture process is a key factor in the change of photoluminescence properties and the cubic phase may be the best structure for photoluminescence. These results suggest that the ammonium ion perovskite (AIP) nanocrystals could be potential materials for optoelectronic applications through A‐site cation substitution.