Cyan-emitting LiBaBO3:Eu2+ phosphor was synthesized by solid-state reaction at 800 degrees C. Structure refinement by Rietveld method reveals that LiBaBO3 crystallizes in a monoclinic cell, space groups P2(1)/c or P2(1)/n. Upon 365 nm excitation, LiBaBO3:Eu2+ shows a symmetric emission band peaking at 496 nm with full-width at half-maximum of 80 nm; when monitoring at 496 nm, a broad excitation band in the UV region (250-420 nm) is observed. The luminescence property of LiBaBO3:Eu2+ is considerably different from LiSrBO3:Eu2+ which holds the same space group. The local structures of the two hosts are compared to explain the different behaviors of Eu2+. (C) 2015 Elsevier B.V. All rights reserved.