Persistent luminescence features in hexagonal Sr_(0.75)Al_(1.5)Si_(0.5)O_4:Eu~(2+) phosphor

摘要

Rare earth doped aluminates, such as SrAl_2O_4:Eu~(2+),Dy~(3+) and CaAl_2O_4 :Eu~(2+),Nd~(3+), are among the best known materials for persistent luminescence or afterglow emission. Their Eu~(2+) counterparts, which were beforehand finely studied, also exhibit long lasting luminescence properties. It recently appeared that the hexagonal polymorph of SrAl_2O_4, which is not stable at room temperature, could have promising luminescent properties. A recently efficient way to elaborate the hexagonal Sr_(1-x/2)Al_(1-x)Si_xO_4:Eu~(2+), with interesting photoluminescence properties, has been developed by full glass crystallization. Still, the persistent luminescence properties of this strontium aluminosilicate compound have never been reported. Here, advanced optical properties such as persistent luminescence emission, persistent luminescence decay and thermoluminescence have been performed in order to report about the persistent luminescence potential of the strontium aluminosilicate hexagonal polymorph.