Abstract
A series of rare earth polyborate with the general formula LiCaRE5(BO3)6 (RE = Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) were synthesized by high temperature solid state reactions. In literature, the Cd-analogues and LiCaTb5(BO3)6 were reported, here Rietveld refinements were performed on high quality powder X-ray diffraction data and the crystallographic parameters were obtained for the title compounds. Eu3+-luminescence in LiCaRE5(BO3)6 (RE = Gd, Y, Lu) were characterized. Eu3+ activators were doped into both the close-to-centrosymmetric and strongly-distorted coordination environments. Overall, bright orange-red emission can be observed with a slight increase of the red-to-orange (R/O) ratio with RE3+ ionic radius increases.
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