Two alkali-earth and rare-earth metal borates, M₃Eu₂(BO₃)₄ (M = Ba, Sr), have been synthesized and their crystal structures determined by single-crystal XRD methods with the following crystal data: Ba₃Eu₂(BO₃)₄ (1), Pnma, a = 7.6970(15) Å, b = 16.554(3) Å, c = 8.9300(18) Å, V = 1137.8(4) ų, Z = 4; Sr₃Eu₂(BO₃)₄ (2), Pnma, a = 22.2553(4) Å, b = 15.9122(3) Å, c = 8.7568(2) Å, V = 3101.05(11) ų, Z = 12. The compound 1 is isotypic with Ba₃RE₂(BO₃)₄ (RE = Y, La, Pr, Nd) and its crystal structure features a 3D framework constructed by BO₃ triangles and 8-fold coordinated positions M1, M2 and M3 with mixed Eu/Ba occupation. 2 adopts a threefold superstructure of the structure of 1. IR and Raman spectra further confirm that both 1 and 2 contain the planar triangular BO₃ groups. The photoluminescence spectra of 1 and 2 consist of five groups of emission bands assigned to the ⁵D₀→⁷F_j (j = 0, 1, 2, 3, 4) transitions within Eu³⁺ ions and the decay curves show the single-exponential behavior with the lifetime being 1.358 and 0.887 ms for 1 and 2, respectively. 1 possess a very high luminescent efficiency (QE = 90.09%) which benefited to being applied in warm white LEDs. Moreover, X-ray photoelectron spectroscopy (XPS) is used to analyze the chemical states of the elements and the band electronic structure on 1 has also been investigated.

合成了两种碱土金属和硼酸金属硼酸盐M ₃ Eu ₂（BO ₃）₄（M = Ba，Sr），并通过单晶XRD方法确定了晶体结构，并具有以下晶体数据：Ba ₃ Eu ₂（BO ₃）₄（1），Pnma，a  ＝ 7.6970（15），b  ＝ 16.554（3），c  ＝ 8.9300（18），V  ＝ 1137.8（4），³ ，Z  ＝ 4。Sr ₃ Eu ₂（BO ₃）₄（2），晶Pnma，一个 = 22.2553（4），b  = 15.9122（3）埃，c ^  = 8.7568（2）埃，V  = 3101.05（11）一种³，Ž  = 12的化合物1是同种型用Ba ₃ RE ₂（BO ₃）₄（RE = Y，La，Pr，Nd）及其晶体结构具有3D骨架，该骨架由BO ₃三角形和8倍协调位置M1，M2和M3构成，具有Eu / Ba混合占据。2采用1的结构的三重上部结构。红外光谱和拉曼光谱进一步证实了1和2个包含平面三角形BO ₃组。1和2的光致发光光谱由五组发射带组成，这些发射带分配给Eu ³⁺离子中的⁵ D ₀ → ⁷ F _j（j = 0、1、2、3、4）跃迁，并且衰减曲线显示单个指数行为，寿命分别为1和2的1.358和0.887 ms 。1个具有非常高的发光效率（QE = 90.09％），这有利于应用于暖白光LED。此外，使用X射线光电子能谱（XPS）分析元素的化学状态，并研究了1上的能带电子结构。