Abstract
A red-emitting phosphor, is a candidate of Cd-free phosphor for vacuum fluorescent tubes. Luminescence of is quenched at a Sr-rich composition by formation of defects that work as nonradiative centers. At the stoichiometric composition , the luminescence efficiency is increased by addition of , while decreased by addition. Measurement of the unit cell volume showed that and occupy the site, while presumably occupies the site. This site preference shifts the atomic ratio of the site to the Sr-poor side by doping and to the Sr-rich side by doping, resulting in an increase or a decrease in efficiency at the stoichiometric composition. Under electron excitation and at the dopant concentration of per . , doping provides the maximum efficiency about twice higher than the maximum efficiency of an undoped sample. The optimized Sr fraction for doping, , has led to efficiency about 2.7 times as high as efficiency of the undoped .
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