Abstract
We demonstrate, for the first time to our knowledge, two different balances around fluorine-related non-paramagnetic color (FD) centers in fluoride containing phosphate based optical filter glasses at low (190°C) and higher (390°C) heat-treatment temperature, respectively. The thermal bleaching experiment results indicate the heat-treatment bleached gamma radiation induced phosphate-related oxygen hole center (POHC) and oxygen-related hole center (OHC) to some extent due to the release and capture of the electrons in the conduction band. Through the gamma radiation and subsequent heat-treatment experiment, as well as the detailed analysis of photoluminescence and excitation spectra, a general model corresponding to the two different balances about the FD defects and the evolutionary mechanism of these existing defects in the fluoride-containing phosphate based glasses was proposed.
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