Abstract
Persistent spectral hole burning has been observed at room temperature for Eu 3+ incorporated in sodium borate glasses prepared under reducing conditions. The measurements at 77 K indicate that the relative hole area increases with increasing the molar ratio of Eu 2+ to Eu 3+ when the content of Eu 2+ is low, whereas the relative hole is almost independent of the molar fraction of Eu 2+ when the content of Eu 2+ is high. We suggest that photoinduced reduction of Eu 3+ is responsible for the room-temperature hole burning of Eu 3+ in the present sodium borate glasses and that the predominant center which captures a positive hole formed by the reduction of Eu 3+ is the coexisting Eu 2+.
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