Rare earth doped aluminates, such as SrAl2O4 :Eu2+, Dy3+ and CaAl2O4:Eu2+, Nd3+, are among the best known materials for persistent luminescence or afterglow emission [1]. Numerous studies have been carried out on this strontium alumínate to find different elaboration ways and to elucidate its persistent luminescence mechanism (see for instance [2]). It recently appeared that its hexagonal phase polymorph, which is not stable at room temperature, could have promising properties. A recently efficient way to elaborate the hexagonal Sr1-x/2Al1-xSixO4:Eu2+,Dy3+ phases has been developed by glass crystallization. We report here the optical features of Eu2+, Dy3+ co-doped Sr1-x/2Al1-xSixO4 (0 ≤ x ≤ 0.6) powders elaborated by this method. The experimental results show that the photoluminescence as well as the afterglow emissions shift from green to white/blue range as x increases (see Fig. 1-left). This color change toward the white color is due to two effects: the blue shift of Eu2+ broad emission and the appearance of Dy3+ emission.

© 2019 IEEE

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