| 摘要 |
A phosphorescent phosphor having excellent afterglow luminance characteristics, even under low illumination intensity of radiation conditions, compared to conventional strontium aluminate phosphorescent phosphors of the same type, and particularly a phosphorescent phosphor having excellent initial afterglow luminance characteristics and excellent afterglow luminance characteristics at 60 and 90 minutes after cessation of the excitation, with following requirements: 0.015<Eu/(Sr+Ba+Eu+Dy)<=0.05, 0.3<=Dy/Eu<=2, 0.03<=Ba/(Sr+Ba)<=0.2 and 2.1<=Al/(Sr+Ba+Eu+Dy)<=2.9.
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