Fluorescence spectra of ARE2I5 and AREI3 in the solid state (A ≡ K, Rb, Cs, Ti; RE ≡ Sm, Eu)

The fluorescence spectra of ARE2I5(s) and AREI3(s) (A ≡ K, Rb, Cs, Tl; RE ≡ Sm1 Eu) have been studied systematically. The regular shift of the central wavelengths is discussed in a preliminary manner on the basis of crystal lattice field and covalence effects.