Synthesis, Crystal Structure and Photoluminescence Property of Potassium Terbium Polyphosphate KTb(PO3)4

摘要

The potassium terbium polyphosphate crystal KTb(PO_3)_4 has been synthesized using a high temperature solution reaction method. The structure and composition were characterized by single-crystal X-ray diffraction, powder X-ray diffraction and elemental analysis. The compound crystallizes in the monoclinic space group P21/n with a=10.3182(6), b=8.9129(5), c=10.7940(6) ?, β=105.993(1)o, V=954.3 ?~3, Z=4, Mr=513.91, Dc=3.577 g/cm^3, μ=8.585 mm^(-1), F(000)=960, S=0.955,(Δρ)max=1.380,(Δρ)min=–3.428 e/?~3, the final R=0.0301 and w R=0.0400 for 2301 observed reflections with I > 2σ(I). In addition, pure powder of isostructural Rb Tb(PO_3)_4 was synthesized in order to investigate the optical property. Photoluminescence measurements show that both crystals ATb(PO_3)_4(A=K(1), Rb(2)) are promising candidates to become solid-state visible green light-emitting sources.