A study of the Eu3+ charge-transfer state in lanthanide-borate glasses

Abstract

The luminescence properties of the Eu[3+] ion in lanthanide- borate glasses were investigated and compared with those of Eu[3+] in Crystalline GdB3O6. In these materials the emission observed is from the [5]DO to the [7]FJ levels. The rate of nonradiative relaxation from the charge-transfer state to the [7]FJ levels depends strongly on the host material. In the glasses it is high, whereas it is low in the crystalline lattice. Improving the glass quality by the amount of lattice modifiers increases the rate even further. This difference is discussed and explained in terms of a configurational coordinate diagram.