Temperature effect on fluorescence and UV-vis absorption spectroscopic properties of Dy(III) in molten LiCl-KCl eutectic salt

► Spectroscopic characteristics of Dy(III) in the high-temperature LiCl-KCl salt. ► In-situ chemical analysis of Dy(III) by fluorescence and absorbance measurement. ► Temperature effect on hypersensitivity for electronic transitions from 4I13/2 excited state. ► Single chemical species of Dy(III) exists in high-temperature LiCl-KCl salt.