Abstract
Transparent glass-ceramics SiO2–AlF3–BaF2–TiO2–LaF3 (SABTL) containing Ba2LaF7 nanocrystals were successfully prepared by heat treatment process through conventional melting method. The crystal size in the glass-ceramics increased gradually under the changing of heat treatment temperatures and times, which was confirmed by the results of XRD, TEM measurements. The intensity of the blue, green and red upconversion luminescence around 490nm, 525nm, 546nm, 657nm which originate from the transitions 5D4→7FJ (J=6 and 5) of Tb3+ ions and (2H11/2, 4S3/2, 4F9/2)→4I15/2 transitions of Er3+ ions, respectively, were strongly observed after heat treatment under 980nm laser diode excitation. The intensity of upconversion luminescence was increased gradually with the increase of Yb3+ concentrations and reaches its maximum at 2.5mol%. The upconversion luminescence and energy transfer process between Tb3+, Yb3+ and Er3+ ions in the glass-ceramics were discussed.
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