Rare earth (RE) borates have been extensively studied as good photoluminescent materials, however, the target hosts were limited to “RE₃BO₆”, REBO₃, and REB₃O₆ in the RE₂O₃-B₂O₃ phase diagram until the recent discovery of rare earth pentaborate. For the first time, the sol-gel method was employed to synthesize β-LaB₅O₉ doped with Eu³⁺, Tb³⁺, Ce³⁺, Sm³⁺, Dy³⁺. In comparison to the previous synthetic methods, the sol-gel method possesses superiorities including easily-controllable doping concentration, high yield and emission efficiency. Solid solutions of phosphors were prepared and carefully analyzed by powder X-ray diffraction. Concentration quenching or saturation was observed in Eu³⁺, Tb³⁺ and Ce³⁺ doped phosphors at round 10 at%. Eu³⁺, Tb³⁺, Sm³⁺, and Dy³⁺ emit red, green, orange, and close-to-white light, respectively. The absolute emission efficiency of Ce³⁺ is high and in the UV range, suggesting the function of being sensitizer once combined with other activators.

稀土（RE）硼酸盐已被广泛研究作为良好的光致发光材料，但是，目标主机限于“ RE ₃ BO ₆ ”，RE BO ₃，和RE乙₃ ö ₆在RE ₂ ö ₃ -B ₂ ö直到最近发现稀土五硼酸盐为止的₃相图。首次，溶胶-凝胶法用于合成β-LAB ₅ ö ₉掺杂有Eu ³⁺，Tb的³⁺，铈³⁺，钐³⁺，Dy ³⁺。与以前的合成方法相比，溶胶-凝胶法具有包括易于控制的掺杂浓度，高产率和发射效率的优点。制备了磷光体固溶体，并通过粉末X射线衍射对其进行了仔细分析。在Eu ³⁺，Tb ³⁺和Ce ³⁺掺杂的磷光体中，在第10  at％处观察到浓度猝灭或饱和。Eu ³⁺，Tb ³⁺，Sm ³⁺和Dy ^3+分别发出红色，绿色，橙色和接近白色的光。Ce ³⁺的绝对发射效率 紫外线高，在紫外线范围内，提示一旦与其他活化剂结合使用，就具有增敏剂的功能。