Cyan-emitting LiBaBO3:Eu2+ phosphor: Crystal structure and luminescence property comparison with LiSrBO3:Eu2+.

Cyan-emitting LiBaBO 3 :Eu 2+ phosphor was synthesized by solid-state reaction at 800 °C. Structure refinement by Rietveld method reveals that LiBaBO 3 crystallizes in a monoclinic cell, space groups P 2 1 / c or P 2 1 / n . Upon 365 nm excitation, LiBaBO 3 :Eu 2+ 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 LiBaBO 3 :Eu 2+ is considerably different from LiSrBO 3 :Eu 2+ which holds the same space group. The local structures of the two hosts are compared to explain the different behaviors of Eu 2+ . [ABSTRACT FROM AUTHOR]