Optical properties and X-ray luminescence of fluorohafnate glass doping with EuF2

Abstract The luminescence and optical absorption of Eu 2 + -doped fluorohafnate glasses in the HfF 4 –BaF 2 –LaF 3 –AlF 3 –NaF (HBLAN) system have been reported. It is shown that divalent europium does not luminesce in the fluorohafnate glass due to ionization of excited Eu 2 + . The Eu 2 + luminescence appears after heat treatment of the HBLAN glass containing BaCl 2 . At X-ray excitation of the HBLAN glass the luminescence spectrum has a wide intrinsic band in the region of 250–450 nm. The substitution of fluorine with chlorine results as a shift both of the intrinsic luminescence band and of the UV absorption edge to the region of the longer wavelengths.