Abstract
A new Eu 2+ , Dy 3+ : Sr 2 B 5 O 9 Cl phosphor with long persistence was synthesized in a reducing atmosphere by a solid-state reaction process. The pure-phase phosphor was obtained by calcination at 900 °C. The introduction of Eu 2+ into the lattice of the matrix resulted in a broad blue emission centered at 423 nm, which was due to the characteristic 4f6 5 d 1 to 4f 7 energy transfer of Eu 2+ ions. Both Eu-doped and Dy/Eu-codoped phosphors displayed afterglow behaviors due to the electron traps generated by the incorporation of tri-valanced rare earth cations into the original Sr lattice sites. The afterglow of Eu 2+ : Sr 2 B 5 O 9 Cl and Eu 2+ , Dy 3+ : Sr 2 B 5 O 9 Cl phosphors showed standard double exponential decay behaviors, and the Eu 2+ /Dy 3+ co-doped sample demonstrated better afterglow properties than Eu 2+ -doped one. A longer lifetime for the electrons was confirmed after the afterglow decay curve simulation. Based on the analysis of thermally stimulated luminescence (TSL), the difference in afterglow was attributed to the different trap concentrations induced by the Dy 3+ (Eu 3+ ) doping in the Sr 2 B 5 O 9 Cl matrix.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call