Phosphorescent phosphor and phosphorescent pigment
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United States of America Patent
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Apr 28, 2015
Grant Date -
Jan 24, 2013
app pub date -
Jun 6, 2011
filing date -
Jun 11, 2010
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Abstract
An object of the present invention is to provide a phosphorescent phosphor having an excellent afterglow luminance after 10 to 12 hours after sunset under the outdoor excitation conditions. The phosphorescent phosphor is represented by the formula (Sr1-a-b-x-yMgaBabEuxDyy)Al2O4, wherein a satisfies a relation 0.02≦a≦0.1, b satisfies a relation 0.03≦b≦0.15, x satisfies a relation 0.001≦x≦0.04, y satisfies a relation 0.004≦y≦0.05, and (a+b) satisfies a relation 0.08≦(a+b)≦0.2. The phosphorescent phosphor has an excellent afterglow luminance after a long period of period of time in a manner most suitable for outdoor applications.
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