| 摘要 |
Rare-earth oxysulfide luminescent materials are recrystallized by liquid phase sintering in a vitreous flux. The vitreous flux composition is the heat reaction product of one or more alkali metal ions selected from the group consisting of lithium, sodium, and potassium with an oxide selected from the group consisting of SiO2, GeO2, and B2O3, including mixtures thereof. Various methods of preparation can be used which includes firing a preformed vitreous flux with the oxysulfide phosphor crystals as well as converting a rare-earth oxide mixture with a sulfurizing agent to oxysulfide phosphor crystals in the presence of source materials for the vitreous flux and thereafter recrystallizing the phosphor crystals in the vitreous flux which is formed in situ.
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