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Tuomisto, M.
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article
Phosphate glasses with blue persistent luminescence prepared using the direct doping method
Abstract
<p>Phosphate glasses with the composition (90NaPO<sub>3</sub>-(10-x)Na<sub>2</sub>O-xNaF) (mol%) with x = 0 and 10 were prepared with blue persistent luminescence (PeL) using direct particles doping method. Commercial CaAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Nd<sup>3+</sup> microparticles (MPs) with blue PeL were added in the glass melt at a lower temperature than the melting temperature. The PeL properties of the glasses were related to the diffusion of Al from the MPs to the glass occurring during the glass preparation, which was found to depend on the temperature at which the MPs are added in the melt and also on the time before casting the melt after adding the MPs. The glass with x = 0 can be prepared with homogeneous PeL if the MPs are added at 575 °C. This T<sub>doping</sub> temperature can be reduced to 550 °C by replacing Na<sub>2</sub>O by NaF in the glass.</p>