Photoluminescence of Ce3+, Tb3+, and Mn2+ in classes of base composition LaMgB5O10

The photoluminescence of Ce3+, Tb3+, and Mn2+ ions was studied in glasses of base composition LaMgB5O10. An NMR spectroscopy investigation proved the close arrangement of the boron oxygen network in both crystalline and vitreous phases. Ce3+ occupies two families of sites and acts in codoped glasses as a donor in the processes of the Tb3+ and Mn2+ luminescences, A detailed analysis of the Ce3+ --> Mn2+ energy transfer evidences the increasing influence of the exchange mechanism as the Mn2+ acceptor concentration increases, Finally the combined luminescences of the three activators under a unique UV excitation allows the observation of white light. (C) 1996 Academic Press, Inc.