Na3Tb(PO4)2: Synthesis, crystal structure and greenish emitting properties

• DOI: 10.1016/j.jpcs.2017.10.044
• Publication Date: 2017-11-02T02:16:41Z
• Authors: Dan Zhao; Zhao Ma; Bao-Zhong Liu; Rui-Juan Zhang; Zhi-Qiang Wu; Jian Wang; Pei-Gao Duan
• Keywords: Monoclinic crystal system; Anhydrous; Crystal (programming language)

Abstract A anhydrous orthoborate Na3Tb(PO4)2 has been prepared and its crystal structure was determined by X-Ray diffraction of a non-merohedral twinned single crystal. The results show that the compound crystallizes in monoclinic space group C2/c and the structure features a 3D framework containing PO4, NaO6, NaO7, NaO8 and TbO8 polyhedra. Under near-UV excitation (370 nm), Na3Tb(PO4)2 shows intense characteristic emission bands of Tb3+ (490 nm, 543 nm, 585 nm and 620 nm) with the CIE coordinate of (0.3062, 0.5901), corresponding to greenish color. The excitation spectrum covers a wide range from 340 nm to 390 nm, which indicates that phosphor Na3Tb(PO4)2 can be efficiently activated by near-UV LED ship.