LiHo(PO₃)₄

Abstract

Lithium holmium(III) polyphosphate(V), LiHo(PO3)4, belongs to the type I of polyphosphates with general formula ALn(PO3)4, where A is a monovalent cation and Ln is a trivalent rare earth cation. In the crystal structure, the polyphosphate chains spread along the b-axis direction, with a repeat period of four tetra­hedra and 21 inter­nal symmetry. The Li and Ho atoms are both located on twofold rotation axes and are surrounded by four and eight O atoms, leading to a distorted tetra­hedral and dodeca­hedral coordination, respectively. The HoO8 polyhedra are isolated from each other, the closest Ho⋯Ho distance being 5.570 (1) Å.

Structure determination, electronic and optical properties of rubidium holmium polyphosphate RbHo(PO3)4

“…The isolation of HoO 8 polyhedra gives rise to the large Ho-Ho distances, the shortest of which is 6.3844(4) Å. To our knowledge, such large Ho-Ho distances have been not reported in the M I Ho(-PO 3 ) 4 family [8,9,23], which can possibly avoid concentration fluorescence quenching [24,25]. So, luminescent performance of RbHo(PO 3 ) 4 is worth expecting.…”

“…In the system material, the common basic structural unit is PO 4 group, and the varied condensation of PO 4 groups results in several structural families with the general formula M I LnP 2 O 7 [5], M I Ln(PO 3 ) 4 [6], and M I 3 LnðPO 4 Þ 2 [7] (M I = alkali metal, Ln = rare earth metal), etc. Recently, to our knowledge, structures and optical properties of some polyphosphates MLn(PO 3 ) 4 (M = Li, Na, K, Ln = La, Eu, Tb, Ho, Yb, Y, Dy) [8][9][10][11][12][13] were successively reported. We have also made efforts to synthesize MLn(PO 3 ) 4 (M = K, Cs, Ln = La, Ce, Eu) [14][15][16].…”

Structural, Luminescence, and Electronic Properties of Potassium Holmium Cyclotetraphosphate KHoP4O12: Experiment and Theory

“…[13,21] The isolation of HoO 8 polyhedron (Figure 2) gives rise to the large Ho-Ho distances, the shortest one of which is around 5.9942(9) Å, as it can be observed in LiHoP 4 O 12 [5.570 (1) Å]. [22] This possibly results in the decreased interaction of Ho-Ho. So, a decreased concentration fluorescence quenching may be predicted.…”