title: Na2RE2TeO4(BO3)2 (RE = Y, Dy-Lu): luminescent and structural studies on a series of mixed metal borotellurates.
abstract: The first examples of metal borotellurates, namely, Na2RE2TeO4(BO3)2 (RE = Y, Dy-Lu) have been prepared by using solid-state reactions. They possess similar structures and crystallize in space group P21/c (No. 14). These compounds feature a novel [RE2TeO4(BO3)2](2-) 3D network structure composed of linear [TeO4(BO3)2](8-) anions interconnected by RE(3+) ions with the voids of the network filled by the Na(+) ions. They exhibit high thermal stability (higher than 800 °C). Results of magnetic measurements on Dy, Ho, and Er compounds indicate that they display weak antiferromagnetic interaction between RE(III) centers. Luminescent studies show that Na2Er2TeO4(BO3)2 has a strong emission at 1.562 μm with a wide fwhm (70 nm) and moderate lifetime (0.18 ms), whereas Na2Yb2TeO4(BO3)2 has a strong NIR region emission around 1.02 μm. Furthermore, UV-vis-NIR absorption spectra, infrared spectra, and DFT calculations for the Y compound as a representative were also accomplished.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences , Fuzhou 350002, P. R. China.
authors.forename: Jiang-He
authors.initials: JH
authors.lastname: Feng
authors.forename: Chun-Li
authors.initials: CL
authors.lastname: Hu
authors.forename: Xiang
authors.initials: X
authors.lastname: Xu
authors.forename: Fang
authors.initials: F
authors.lastname: Kong
authors.forename: Jiang-Gao
authors.initials: JG
authors.lastname: Mao