Nelson R D, Santra K, Wang Y, Hadi A, Petrich J W, Panthani M G
Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA. panthani@iastate.
Department of Chemistry, Iowa State University, Ames, IA 50011, USA and U.S. Department of Energy, Ames Laboratory, Ames, IA 50011, USA.
Chem Commun (Camb). 2018 Apr 5;54(29):3640-3643. doi: 10.1039/c7cc07223f.
Perovskite-phase cesium bismuth halide (Cs3Bi2X9; X = Cl, Br, I) nanocrystals were synthesized using a hot-injection approach. These nanocrystals adopted ordered-vacancy perovskite crystal structures and demonstrated composition-tunable optical properties. Growth occurred by initial formation of Bi0 seeds, and morphology was controlled by precursor and seed concentration. The Cs3Bi2I9 nanocrystals demonstrated excellent stability under ambient conditions for several months. Contrary to previous reports, we find that photoluminescence originates from the precursor material as opposed to the Cs3Bi2X9 nanocrystals.
采用热注入法合成了钙钛矿相卤化铯铋（Cs3Bi2X9；X = Cl、Br、I）纳米晶体。这些纳米晶体具有有序空位钙钛矿晶体结构，并表现出成分可调的光学性质。通过最初形成Bi0种子来实现生长，并且形态由前驱体和种子浓度控制。Cs3Bi2I9纳米晶体在环境条件下几个月内都表现出优异的稳定性。与之前的报道相反，我们发现光致发光源于前驱体材料而非Cs3Bi2X9纳米晶体。
