| 摘要 |
The present invention provides a luminous storage material that emits a blue or bluish green light, that has high persistence, that is thermally and structurally stable, and that exhibits a high weather resistance in chemically severe conditions. The present invention also provides manufacturing method for this material. A blue aluminum silicate luminous storage material according to this invention is composed of a powdered product that has been activated by Eu2+ wherein its composition formula is expressed as follows:(Ml-n-mM*n-Eum)(Al1-xSi+E,fra 3/4+EE x &squ& +E,fra 1/4+EE x)2O4(wherein &squ& is vacancy; M is one or more types of alkali earth metal elements selected from a group of magnesium, calcium, strontium, and barium; M* is one or more types of bivalent metal elements selected from a group of manganese, zinc, and cadmium; and (n), (m), and (x) consist of numerical values meeting the ranges 0</=n</=0.2, 0<x<0.6, 0.0001</=m</=0.1).
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