Solid-state reaction preparation and photoluminescence properties of Na2Ba6(Si2O7)(SiO4)2:Eu2+ phosphors

A kind of novel green-emitting phosphor Na2Ba6(Si2O7)(SiO4)2:Eu2+ was synthesized by a solid-state reaction. The phase formation of as-prepared sample was investigated by X-ray powder diffraction. The photoluminescence emission (PL) and excitation (PLE) spectra results indicated that the phosphor could be efficiently excited by ultraviolet (UV) light from 240 to 400 nm, and presented a broad green emission band with two-band profile suggesting two different emission centers occupied by Eu2+. The critical quenching concentration of Eu2+ was determined to be 0.01 mol and the concentration quenching mechanism was also investigated.