LUMINESCENCE OF Er³⁺ ION IN NONCRYSTALLINE FLUORIDE

Some luminescence of Er³⁺ ions in the fluoride glasses are studied. One of the cross-relaxations of Er³⁺ ions is between and ²H_11/2-⁴I_9/2 and ⁴I_{15 /2} -⁴I_13/2. The Er³⁺ - Er³⁺ ions interaction causing the cross-relaxation in the fluoride glasses is an electric dipole-dipole interaction.