“…Correspondingly, a Bi-related signal appears in the near UV range in the excitation spectra. The energy position of the maximum of this Bi-related band has been determined in AVO 4 :Bi 3+ ;RE 3+ (A = La, Gd, Y;RE = Eu, Dy, Er, Sm) [16,19,[31][32][33] [37] and CaTiO 3 :Bi 3+ ;Pr 3+ [38,39]. For all, it was found that these energy positions obeyed to Eq.…”