Improved photoluminescence properties of a new green SrB2O4:Tb3+ phosphor by charge compensation

► New green-emitting SrB2O4:Tb3+ phosphor was synthesized by solid-state reaction. ► Li+, Na+, and K+ can all increase luminescent intensity of SrB2O4:Tb3+. ► Na+ is the optimal charge compensator among Li+, Na+ and K+. ► SrB2O4:Tb3+ is a promising green phosphor for fabricating WLED.