Borate-phosphates exhibit a wide range of compositional and structural diversity, making them ideal hosts for luminescent materials. In this work, a new borate-phosphate compound CsNa2Dy2(BO3)(PO4)2 has been prepared under high temperature solution growth method. It crystallizes in an orthorhombic space group Cmcm with the following lattice parameters determined by single-crystal X-ray diffraction: a = 6.9709(5), b = 14.9699(11), c = 10.6480(8) Å, z = 4. Its structure contains isolated BO3 planar triangles and PO4 tetrahedra, which are interconnected by Cs+, Na+ and Dy3+ ions. Solid solutions of CsNa2Y2(1−x)Dy2x (BO3)(PO4)2 (x = 0 − 0.08) are prepared and exhibit a yellow emissive luminescence by near-UV excitation due to the 4F9/2 → 6H(13/2, 15/2) transitions of Dy3+. The optimized concentration of Dy3+ is x = 0.01, and if over this critical value, the luminescent intensity will decrease due to concentration quenching. The Commission International de L’Eclairage (CIE) coordinates for CsNa2Y1.98Dy0.02(BO3)(PO4)2 are (x = 0.377, y = 0.404), corresponding to yellow color. The prepared phosphor may serve as a yellow phosphor for NUV-excited LEDs.

中文翻译：

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五元硼酸磷酸盐化合物CsNa2Dy2(BO3)(PO4)2的合成、晶体结构及发光性能

硼酸盐-磷酸盐表现出广泛的组成和结构多样性，使其成为发光材料的理想主体。在这项工作中，一种新的硼酸盐-磷酸盐化合物 CsNa2镝2（博3)(采购订单4）2采用高温溶液生长法制备。它在斜方空间群中结晶厘米厘米具有通过单晶X射线衍射测定的以​​下晶格参数：A= 6.9709(5),乙= 14.9699(11),C= 10.6480(8) 埃,z= 4. 其结构含有孤立的BO3平面三角形和 PO4四面体，由 Cs 互连+, 钠+和镝3+离子。CsNa固溶体2是2(1−X）镝2X （博3)(采购订单4）2（X= 0 − 0.08) 被制备并由于近紫外激发而表现出黄色发光4F9/2→6H(13/2, 15/2)Dy 的跃迁3+。Dy的最佳浓度3+是X= 0.01，超过该临界值，发光强度会因浓度猝灭而降低。国际照明委员会 (CIE) 协调 CsNa2是1.98镝0.02（博3)(采购订单4）2是 （X= 0.377,y= 0.404)，对应于黄色。所制备的磷光体可以用作NUV激发LED的黄色磷光体。