Development of modified micro-pulling-down method for bromide and chloride single crystals

✍ Scribed by Yuui Yokota; Noriaki Kawaguchi; Kentaro Fukuda; Takayuki Yanagida; Akira Yoshikawa; Martin Nikl

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 742 KB
• Volume: 318
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2010.10.183

✦ Synopsis

We developed a modified micro-pulling-down (m-PD) method for the crystal growth of halide materials with highly hygroscopic nature. A removable chamber system of the modified m-PD method that can enter a globe box filled with Ar gas enabled to handle starting materials, set up a crucible and hot zone, grow a single crystal from the melt and take out a grown crystal without exposing to outside atmosphere. By the modified m-PD method, CeCl 3 and Ce 1% doped LaBr 3 single crystals, which were famous as scintillator with high light yield and energy resolution were grown. Grown CeCl 3 and Ce:LaBr 3 single crystals indicated high transparency and they have no visible cracks and inclusions. In photoluminescence measurements, emission peak around 365 nm was observed for CeCl 3 single crystal and Ce:LaBr 3 single crystal indicated two emission peaks around 360 and 380 nm, which originated from 5d-4f transition of Ce 3 + ion.