TY - JOUR
T1 - Assessment for Anion-Exchange Reaction in CsPbX3 (X = Cl, Br, I) Nanocrystals from Bond Strength of Inorganic Salt
AU - Lv, Wenzhen
AU - Tang, Xingxing
AU - Li, Ling
AU - Xu, Ligang
AU - Li, Mingguang
AU - Chen, Runfeng
AU - Huang, Wei
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/10/3
Y1 - 2019/10/3
N2 - Anion exchange via inorganic halide precursors is a highly efficient protocol to tune the chemical composition and optoelectronic properties of colloidal cesium lead halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs). However, a simple predication rule of precursors is lacking owing to limited understanding of these used halide compounds. Here, we first use the inorganic magnesium halide (MgX2) as a precursor to understand the halide exchange in CsPbBr3 NCs. The samples with Br- exchanged with Cl- or I- display a perfect preservation of cubic morphology, good stability, and high photoluminescence quantum yield. Then, by selecting a series of inorganic metal halide salts with different bond strength as precursors, we further find that the reaction exhibits thermal dynamic driving characteristics and the small energy difference in bonding strength between metal-X in halide salt and Pb-Br in CsPbBr3 NCs is advantageous for the anion exchange according to the vacancy diffusion mechanism. These findings illustrate an easy way to assess the feasibility of the anion-exchange reaction, significantly promoting the synthesis of compositionally diverse metal halide perovskite NCs with various optoelectronic properties.
AB - Anion exchange via inorganic halide precursors is a highly efficient protocol to tune the chemical composition and optoelectronic properties of colloidal cesium lead halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs). However, a simple predication rule of precursors is lacking owing to limited understanding of these used halide compounds. Here, we first use the inorganic magnesium halide (MgX2) as a precursor to understand the halide exchange in CsPbBr3 NCs. The samples with Br- exchanged with Cl- or I- display a perfect preservation of cubic morphology, good stability, and high photoluminescence quantum yield. Then, by selecting a series of inorganic metal halide salts with different bond strength as precursors, we further find that the reaction exhibits thermal dynamic driving characteristics and the small energy difference in bonding strength between metal-X in halide salt and Pb-Br in CsPbBr3 NCs is advantageous for the anion exchange according to the vacancy diffusion mechanism. These findings illustrate an easy way to assess the feasibility of the anion-exchange reaction, significantly promoting the synthesis of compositionally diverse metal halide perovskite NCs with various optoelectronic properties.
UR - http://www.scopus.com/inward/record.url?scp=85072967621&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.9b07248
DO - 10.1021/acs.jpcc.9b07248
M3 - 文章
AN - SCOPUS:85072967621
SN - 1932-7447
VL - 123
SP - 24313
EP - 24320
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 39
ER -