Luminescent properties of Zn 2SiO 4:Mn 2+ phosphor under UV, VUV and CR excitation

Abstract

Zn 2− x SiO 4: xMn 2+ ( 0 < x ⩽ 0.10 ) green phosphors were synthesized by traditional solid-state reaction. Their photoluminescence under ultraviolet (UV), vacuum ultraviolet (VUV) and cathodoluminescence were evaluated. The strongest emission band was observed at about 525 nm (Mn 2+ ( 4T 1→ 6A 1)) upon 254 nm, 147 nm and CR excitation, and the maximum emission intensity of Zn 2− x SiO 4: xMn 2+ ( 0 < x ⩽ 0.10 ) was obtained at the Mn 2+ concentration of x = 0.08 , 0.04, 0.02, respectively. The relaxation of excitation energy under the three excitation energies was investigated; the result shows that Mn 2+ was excited directly under UV excitation; upon CR excitation, the electron beam mainly excited the host lattice; for VUV excitation, Mn's direct excitation and excitation on the host both existed, and an effective energy transfer process could occur from host to Mn 2+ via exchanging interaction in Zn 2SiO 4:Mn 2+.