Luminescent characteristics of Sr_2B_2O_5: Tb~(3+), Li~+ green phosphor

摘要

Tb~(3 +)-doped Sr_2B_2O_5 green phosphor was synthesized by solid-state reaction method. The structure and luminescence properties of the phosphor were studied. The excitation and emission spectra indicate that this phosphor can be effectively excited by ultraviolet (UV) 376 nm, and exhibit bright green emission centered at 545 nm corresponding to the ~5D_4→~7F_5 transition of Tb~(3+). It is shown that the 7 mol% of doping concentration of Tb~(3+) ions in Sr_2B_2O_5: Tb~(3+), Li~+ phosphor is optimum, and the concentration quenching occurs when the Tb~(3 +) concentration is beyond 7 mol%. The concentration quenching mechanism can be interpreted by the quadrupole-quadrupole interaction of Tb~(3 +) ions. The present work suggests that the novel green phosphor is a kind of potential green-emitting phosphor.