Phosphorescent phosphor and phosphorescent pigment
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 (Sr 1-a-b-x-y Mg a Ba b Eu x Dy y )Al 2 O 4 , 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.
1. A phosphorescent phosphor represented by the general formula (Sr 1-a-b-x-y Mg a Ba b Eu x Dy y )Al 2 O 4 , wherein:
a satisfies a relation 0.02≦a≦0.1;
b satisfies a relation 0.03≦b≦0.15;
x satisfies a relation 0.005≦x≦0.03;
y satisfies a relation 0.005≦y≦0.05;
(a+b) satisfies a relation 0.08≦(a+b)≦0.2.
2. A phosphorescent phosphor represented by the general formula (Sr 1-a-c-x-y Mg a Ca c Eu x Dy y )Al 2 O 4 , wherein:
a satisfies a relation 0.02≦a≦0.1;
c satisfies a relation 0.05≦c≦0.1;
x satisfies a relation 0.005≦x≦0.03; and
y satisfies a relation 0.005≦y≦0.05.
3. A phosphorescent pigment, comprising a mixture of:
the phosphorescent phosphor according to claim 1 ; and
an inorganic blue-emitting phosphor.
4. The phosphorescent pigment according to claim 3 , wherein the blue-emitting phosphor comprises at least one of Sr 10 (PO 4 ) 6 Cl 2 :Eu and (Ba, Ca)MgAl 10 O 17 :Eu.
5. A phosphorescent pigment, comprising a mixture of:
the phosphorescent phosphor according to claim 2 ; and
an inorganic blue-emitting phosphor.
6. The phosphorescent pigment according to claim 5 , wherein the blue-emitting phosphor comprises at least one of Sr 10 (PO 4 ) 6 Cl 2 :Eu and (Ba, Ca)MgAl 10 O 17 :Eu.
7. A phosphorescent phosphor represented by the general formula (Sr 1-a-b-c-x-y Mg a Ba b Ca c Eu x Dy y )Al 2 O 4 , wherein:
a satisfies a relation 0.02≦a≦0.1;
(a+b) satisfies a relation 0.08≦(a+b)≦0.2;
(b+c) satisfies a relation 0.03≦(b+c)≦0.15;
b satisfies a relation 0≦b;
c satisfies a relation 0≦c;
x satisfies a relation 0.005≦x≦0.03; and
y satisfies a relation 0.005≦y≦0.05.
8. A phosphorescent pigment, comprising a mixture of:
the phosphorescent phosphor according to claim 7 ; and
an inorganic blue-emitting phosphor.
9. The phosphorescent pigment according to claim 8 , wherein the blue-emitting phosphor comprises at least one of Sr 10 (PO 4 ) 6 Cl 2 :Eu and (Ba, Ca)MgAl 10 O 17 :Eu.