著者: TODOROKI Shin-ichi Inoue S.
(出版日: 2004-02-15)
https://hdl.handle.net/20.500.11932/28369 
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NIMS成果物 |
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 オンラインリソース
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English |
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5 p.
(39 - 43)
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Handle URI: https://hdl.handle.net/20.500.11932/28369
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Fluorescence lifetime of Er3+ was measured for F-doped tellurite
glasses with parallel heat treatment under a temperature gradient
atmosphere in order to find the annealing condition to make transparent
glass ceramics in which Er3+ ions are located in the precipitated
crystals. The preparation and annealing of the samples were performed
in a vertical temperature gradient furnace, where molten glass was
sucked into a pre-heated Pyrex glass tube. The annealing temperature
range is between 350 degC and 800 degC. After the annealing
treatment, time-resolved fluorescence emission of Er3+ (1.55um;
excitation light source is 977nm) were measured sequentially along the
tube. The lifetime of the emission was about 2.6 msec for as-prepared
glass. We have found that the lifetime increased to 5.2 msec when the
glass was annealed at 470 degC for 5 min and 550 degC for 5 min
successively, although its transparency was lost. This increase implies
that the Er3+ ions are embedded in fluorine-rich phase to bring about
reduced non-radiative emission. We are now continuing to find the
condition to get transparent glass ceramics.
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