Luminescent properties of red-emitting LiSr4B3O(9−3x/2)Nx:Eu2+ phosphor for white-LEDs

► An oxynitride LiSr4B3O9N:Eu2+ red-emitting phosphor was prepared at low synthesis temperature. ► The introduced nitrogen improved the excitation and emission intensity of the phosphor. ► The wide excitation band matches well with near-UV LED chips. ► The emission spectrum of the phosphor showed a broad full width at half maximum of about 106 nm.