Photoluminescence properties of Ba2ZnSi2O7:Eu2+, Re3+ (Re=Dy, Nd) long lasting phosphors prepared by the combustion-assisted synthesis method

Abstract Long lasting alkaline earth silicates, Ba 2 ZnSi 2 O 7 :Eu, Dy, Ba 2 ZnSi 2 O 7 :Eu, Nd and Ba 2 ZnsSi 2 O 7 :Eu, Dy, Nd were prepared by the combustion-assisted synthesis (CAS) method. The obtained phosphors were characterized by means of X-ray diffraction (XRD) and their photoluminescence spectrum (PSL). The emission spectrum shows a single band centered at 503 nm, which corresponds to the 4f 6 5d 1 → 4f 7 transition of Eu 2+ . The Ba 2 ZnSi 2 O 7 :Eu phosphors showed blue-green afterglow ( λ em = 503 nm) when Dy 3+ and Nd 3+ ions were doped. The electron affinity (ea) value for Eu 2+ in [EuO 8 ] was calculated to be 1.63 eV. When the concentration quenching of Dy 3+ and Nd 3+ was over 0.07, the afterglow of the phosphors is enhanced.