Photoluminescence properties and energy transfer from Ce super(3+) to Tb super(3+) in Zn sub(2)SiO sub(4) host

Zn sub(2)SiO sub(4): Tb super(3+), Zn sub(2)SiO sub(4): Ce super(3+), Zn sub(2)SiO sub(4): Tb super(3+), Ce super(3+) phosphors were prepared by solidstate reaction at 1 150 degree C for 2 h under a weak reducing atmosphere. Moreover, the XRD patterns and photoluminescence spectra were recorded and the effects of Tb super(3+) and Ce super(3+) concentration on the luminescent properties of as-synthesized phosphors were investigated. The emission spectra under ultraviolet light (333 nm) radiation showed a dominant peak at 542 nm attributed to the super(5)D sub(4) arrow right super(7)F sub(5) transition of Tb super(3+), which was enhanced significantly (about 45 times) by the co-doping of Ce super(3+), indicating that there occurred an efficient energy transfer from Ce super(3+) to Tb super(3+). According to the Dexter's energy transfer formula of multipolar interaction, it was demonstrated that the energy transfer between Ce super(3+) and Tb super(3+) was due to the electric dipolar-dipolar interaction of the resonance transfer.