Vibrational Spectra of Water- and Ammonium-Chloride-Related Residues and Upconversion Fluorescence of Er3+ in ZnCl2-Based Glasses |
| |
Authors: | Noriyuki Wada Takashi Tsuneoka Kazuo Kojima |
| |
Affiliation: | Department of Applied Chemistry, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan |
| |
Abstract: | Chloride glasses of the ZnCl2 and 20KCl-20BaCl2-60ZnCl2-0.5ErCl3 systems were prepared using NH4Cl as a dehydrating and chlorinating agent, under the melt-quenching method. Water- and ammonium-chloride-related residues in ZnCl2 glasses were investigated by infrared and near-infrared absorption spectra. Water, Zn—OH, ClO, ClO2?, Zn2+-coordinated water, free NH3, NH4+, and Zn2+-coordinated NH3 were identified in ZnCl2 glasses. 20KCl-20BaCl2-60ZnCl2-0.5ErCl3 glasses prepared by melting at 500°C for 20 min, under reduced pressure, contained the smallest amounts of water, Zn—OH, and Zn2+-coordinated NH3 and showed strong Er3+ upconversion fluorescence. |
| |
Keywords: | erbium/erbium compounds fluorescence glass zinc |
|
|