Abstract
New oxyfluoride glasses and glass ceramic codoped with Nd3+,Yb3+ and Ho3+ were prepared. The x-ray diffractionanalysis revealed that the heat treatments of the oxyfluorideglasses could cause the precipitation of (Nd3+, Yb3+,Ho3+)-doped fluorite-type crystals. Very strong greenup-conversion luminescence due to the Ho3+: (5F4,5S2)→5I8 transition under 800-nm excitation wasobserved in these transparent glass ceramics. The intensity of the greenup-conversion luminescence in a 1-mol% YbF3-containing glassceramic was found to be about 120 times stronger than that in theprecursor oxyfluoride glass. The reason for the highly efficientHo3+ up-conversion luminescence in the oxyfluoride glass ceramicsis discussed.
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