Abstract
Transparent glass ceramics have been obtained by nucleation and growth of Y 2Te 6O 15 or Er 2Te 5O 13 cubic phase in a new Er 3+-doped oxyfluoride tellurite glass. Effect of heat treatment on absorption spectra, luminescence and up-conversion properties in the oxyfluoride tellurite glass has been investigated. With heat treatment the ultraviolet absorption edge red shifted evidently for the oxyfluoride telluride glass. The near infrared emission that corresponds to Er 3+: 4I 13/2 → 4I 15/2 can be significantly enhanced after heat treatment. Under 980 nm LD pumping, red and green up-conversion intensity of Er 3+ in the glass ceramic can be observed much stronger than that in the base glass.
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