Comprehension of the photoinduced charge transfer assisted energy transfer in Gd-based host sensitized tellurate phosphors for thermal sensing and anticounterfeiting labels.

A series of novel Eu-activated BaGdTeO (BGT) phosphors were successfully synthesised a high temperature solid state reaction method. The crystal structure analysis showed that Eu-doped BaGdTeO double perovskite phosphors possess monoclinic symmetry with space group 2/. The as-prepared phosphors can be efficiently excited by far-ultraviolet light to generate reddish orange luminescence of around 593 nm corresponding to the D → F transitions of Eu ions.