Abstract: Li₂B₄O₇:Eu³⁺ phosphors were synthesized by solid state reaction in ambient air. The optimum preparing conditions were studied and phase analyses were carried out by the powder
XRD method. The luminescent properties of Li₂B4O7:Eu³⁺ under ultraviolet light excitation were studied. The results show that the structure of the borate contains both [BO₃] and [BO₄]
coordination polyhedra, the predominant emission of Eu³⁺ is ⁵D₀--⁷F₂ transition, demonstrating that the rare earth ions occupy the non-centrosymmetrical sites in Li₂B₄O₇ and Eu³⁺ ion can be stable in the matrix.