BLUE TO UV UP-CONVERTER COMPRISING LANTHANIDE IONS SUCH AS PR³⁺ ACTIVATED AND OPTIONALLY GD³⁺ CO-ACTIVATED SILICATES AND ITS APPLICATION FOR SURFACE DISINFECTION PURPOSES

摘要

A silicate-based lanthanide ion doped material for converting electromagnetic radiation energy of a longer wavelength of below 530 nm to electromagnetic radiation energy of shorter wavelengths in the range of 220 to 425 nm, wherein the silicate-based material is a crystalline silicate material doped with lanthanide ions selected from praseodymium, gadolinium, erbium, neodymium and for co-doping at least two of them. Further the silicate-based material is obtainable, in particular, from a blend comprising salts and an organic solvent followed by specific calcination processes and tribological impacts to adjust particle sizes and increase the crystallinity of the particles. The silicate-based material can be used to inactivate microorganisms or cells covering a surface comprising the silicate-based material under exposure of electromagnetic radiation energy of a longer wavelength of below 500 nm.