For the first time, a mixed-alkali diphosphate, Li₂Na₂P₂O₇, has been successfully obtained by high-temperature solution growth (HTSG) method. Single crystal X-ray diffraction analysis reveals that it contains anionic [Li₂P₂O₇]_∞ network and 1D [Na]_∞ infinite chains, which are both running along the c-axis. Band structure calculations by density functional theory (DFT) method indicate that Li₂Na₂P₂O₇ has an indirect band gap of about 4.88 eV. Moreover, 1 mol% Eu³⁺ doped Li₂Na₂P₂O₇ phosphor was synthesized and its photoluminescence properties were investigated. Under near ultraviolet (NUV) excitation (394 nm), Li₂Na₂P₂O₇:0.01Eu³⁺ phosphor exhibits a series of emission peaks corresponding to the ⁵D₀→⁷F_J (J = 0, 1, 2, 3, 4) transitions of Eu³⁺ ion with the CIE chromaticity coordinates of (0.599, 0.375).

首次通过高温溶液生长（HTSG）方法成功获得了混合碱式二磷酸盐Li ₂ Na ₂ P ₂ O ₇。单晶X射线衍射分析表明，它包含阴离子[Li ₂ P ₂ O ₇ ] _∞网络和一维[Na] _∞无限链，它们均沿c轴延伸。通过密度泛函理论（DFT）方法计算的能带结构表明，Li ₂ Na ₂ P ₂ O ₇具有约4.88  eV的间接带隙。而且1 合成了摩尔％Eu ³⁺掺杂的Li ₂ Na ₂ P ₂ O ₇荧光粉，研究了其发光特性。在近紫外（NUV）激发（394  nm）下，Li ₂ Na ₂ P ₂ O ₇：0.01Eu ³⁺荧光粉显示出一系列的发射峰，对应于⁵ D ₀ → ⁷ F _J（J = 0，1，2 ，3、4）Eu ³⁺离子的跃迁，其CIE色度坐标为（0.599，0.375）。