PHOTOLUMINESCENCE OF CE3+, TB3+, AND MN2+ IN CLASSES OF BASE COMPOSITION LAMGB5O10

The photoluminescence of Ce3+, Tb3+, and Mn2+ ions was studied in glas ses of base composition LaMgB5O10. An NMR spectroscopy investigation p roved the close arrangement of the boron oxygen network in both crysta lline and vitreous phases. Ce3+ occupies two families of sites and act s in codoped glasses as a donor in the processes of the Tb3+ and Mn2luminescences, A detailed analysis of the Ce3+ --> Mn2+ energy transfe r evidences the increasing influence of the exchange mechanism as the Mn2+ acceptor concentration increases, Finally the combined luminescen ces of the three activators under a unique UV excitation allows the ob servation of white light. (C) 1996 Academic Press, Inc.