Underwater luminescence of SrAl2O4:Eu2+, Dy3+ persistent phosphor

Abstract

An artificial block from concrete and sand covered by SrAl2O4:Eu2 , Dy3 based phosphor was prepared, and a new direction in the study and application of persistent phosphors was proposed. For the first time, underwater luminescence was experimentally studied in real sea conditions. The bright blue-green long-lasting afterglow was demonstrated and registered from a depth of 5 m. The fishes were attracted by the light of the artificial reef.