Tong Liping, Saito Katsuhiko, Guo Qixin, Zhou Han, Guo Xingmei, Fan Tongxiang, Zhang Di
State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China.
J Phys Condens Matter. 2018 Mar 28;30(12):125901. doi: 10.1088/1361-648X/aaaea2.
A correlation function between the Raman intensities and the nearest-neighbor mean-square relative displacement (MSRD) [Formula: see text] of local Bi-O bonds is successfully established based on x-ray absorption fine structure (XAFS) and temperature-dependent Raman spectra in the temperature range 77-300 K in amorphous and crystalline GdYbBiErGaO. The structural symmetries of GdYbBiErGaO are described by using [Formula: see text] of local Bi-O bonds. More importantly, GdYbBiErGaO is found to show excellent infrared (IR) emission properties due to changes in Bi-O bonds, and the IR emission intensities are found to depend on [Formula: see text], by using temperature-dependent photoluminescence spectroscopy. The maximum emission intensity at 1533 nm is obtained when [Formula: see text] [Formula: see text] at the lowest symmetry. This work shows that temperature-dependent Raman intensities can be used effectively to analyze the local covalent bonds around absorbing atoms as well as to study the emission properties of this visible-light-activated IR luminophor.
