Large-Scale Mechanochemical Synthesis of Cesium Lanthanide Chloride for Radioluminescence
Tuhin Samanta, Joo Hyeong Han, Han Uk Lee, Bo Kyung, Yong Min Park, Noolu Srinivasa Manikanta Viswanath, Han Bin Cho, Hyeon Woo Kim, Sung Beom Cho, Won Bin Im
Abstract
Cesium lanthanide chloride (Cs 3 LnCl 6 ), a recently developed class of lanthanide-based zero-dimensional metal halides, has garnered a significant amount of interest because of its potential applications in scintillators, light-emitting diodes, and photodetectors. Although cesium lanthanide chloride demonstrates exceptional scintillator properties, conventional synthesis methods involving solid-state and solution-phase techniques are complex and limited on the reaction scale. This study presents a facile mechanochemical synthesis method for producing Cs 3 CeCl 6, Cs 3 TbCl 6, and Cs 3 EuCl 6 metal halides on a 5 g scale. These materials exhibit intense blue-violet, green, and red emissions upon ultraviolet excitation, with high photoluminescence quantum yields ranging from 54% to 93%. Furthermore, Cs 3 CeCl 6, Cs 3 TbCl 6, and Cs 3 EuCl 6 metal halides exhibit intense radioluminescence spanning from the ultraviolet to the visible region. This research shows the potential of the scalable mechanochemical synthesis of lanthanide-based metal halides for the advancement of luminescent materials for scintillators.