| 摘要 |
A phosphor powder is composed of a host material made of an element coming under the group II of the periodic table and an element coming under the group VI of the periodic table, an activator and a co-activator, the amount ratio of the activator to the host material is 1x10<-4 >to 1x10<-3 >parts by weight when the amount ratio of the host material is 1 part by weight, and the co-activator has a molar concentration equal to a molar concentration of the activator.
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