Structure refinement of Lu2WO6 and luminescent properties of Eu3+, Pr3+ doped Lu2WO6

The crystal structure of Lu2WO6 was determined from Rietveld refinement of X-ray powder diffraction data. It crystallizes in the monoclinic system belonging to space group P2/c (No.13) with lattice parameters: a = 7.5180(1) Å, b = 5.2675(1) Å, c = 11.2245(2) Å, β = 104.61(0)°, V = 430.14(11) Å3, Z = 4. The conventional R indices obtained are Rp = 0.090, Rwp = 0.119 and RB = 0.075. The infinite chain comprised of Lu(2)O8 dodecahedra and Lu(3)O7 decahedra makes up the layer A, and the infinite straight chain is built of four-ring of polyhedra in which the WO6 and Lu(1)O8 groups alternate in layer B, finally, this structure is formed by stacking of these two layers with edge-shared. The X-ray and UV excited luminescence properties of Eu3+ and Pr3+ in Lu2WO6 were investigated: Eu3+ shows high luminescent efficiency in emitting red light, and Pr3+ is less efficient in emitting orange light. The luminescent mechanism of Eu3+ and Pr3+ in the matrix of Lu2WO6 is much different.