LIGHT STORING MATERIAL AND PROCESS FOR PRODUCING THE SAME

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A europium-activated alkaline earth metal aluminate base light storing material characterized in that the afterglow brightness thereof exhibited 120 min after photo-irradiation discontinuation in 23°C atmosphere (Y23°C, 120 min)is at least 0.007 Cd/m2, and that the temperature dependence of afterglow brightness (TD) expressed by the ratio of afterglow brightness thereof exhibited 10 min after photo-irradiation discontinuation in 80°C atmosphere (Y80°C) to afterglow brightness thereof exhibited 10 min after photo-irradiation discontinuation in 23°C atmosphere (Y23°C), Y80°C/Y23°C, is at least 1. This light storing material even when an expensive rare earth element, such as dysprosium, is not used as a co-activator realizes prolonged afterglow and further exhibits thermoluminescence over a wide temperature range to thereby permit use over a wide temperature region with the result that any restriction by the environment of use can be minimized.