Red shift of the PSL spectra by Al3+ doping in BaFBr:Eu2+

Abstract— Photostimulated luminescent (PSL) materials are currently used for digital storage and display in radiography. The phosphor BaFBr:Eu²⁺ doped with Al³⁺ is shown to have a very high PSL intensity, and the peak of the PSL spectrum shifts to a longer wavelength. Compared with BaFBr:Eu²⁺ doped with Ca²⁺, Sr²⁺, or Mg²⁺, BaAlFBr:Eu²⁺ is better suited to the stimulated light wavelength emitted by a semiconductor laser. The red‐shift mechanism is considered to be a FAcenter for BaFBr:Eu²⁺ doped with Ca²⁺, Sr²⁺, or Mg²⁺ and a F^Z1 center for BaFBr:Eu²⁺ doped with Al³⁺.