Luminescent characteristics of Sr2B2O5: Tb3+, Li+ green phosphor

Tb3+-doped Sr2B2O5 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 D-5(4) -> F-7(5) transition of Tb3+. It is shown that the 7 mol% of doping concentration of Tb3+ ions in Sr2B2O5: Tb3+, Li+ phosphor is optimum, and the concentration quenching occurs when the Tb3+ concentration is beyond 7 mol%. The concentration quenching mechanism can be interpreted by the quadrupole-quadrupole interaction of Tb3+ ions. The present work suggests that the novel green phosphor is a kind of potential green-emitting phosphor. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.