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Sedda, Ahmed
Lappeenranta-Lahti University of Technology
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article
CaWO<sub>4</sub>:Yb<sup>3+</sup>,Tm<sup>3+</sup> Crystals and SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Phosphors in Glass-Based Composites for Green Afterglow after NIR Excitation
Abstract
<jats:p>Here, we present the preparation of composites with green persistent luminescence using melting process. The composites are phosphate glass (75NaPO<jats:sub>3</jats:sub>-25CaF<jats:sub>2</jats:sub> and 90NaPO<jats:sub>3</jats:sub>-10NaF (in mol%)) with embedded phosphors: CaWO<jats:sub>4</jats:sub>: Yb<jats:sup>3+</jats:sup>, Tm<jats:sup>3+</jats:sup> crystals with blue upconversion and SrAl<jats:sub>2</jats:sub>O<jats:sub>4</jats:sub>:Eu<jats:sup>2+</jats:sup>,Dy<jats:sup>3+</jats:sup> with green persistent luminescence. Green persistent luminescence above 0.3 mcd/m<jats:sup>2</jats:sup> can be seen for ~ 30 minutes after charging with 980 nm due to energy transfer between the blue upconverter crystals and the persistent luminescent phosphors. Challenges related to the fabrication of such composites are discussed.</jats:p>