Red photoluminescence and crystal structure of Sr3Y2(BO3)4

The crystal structure of a new compound Sr(3)y(2)(BO3)(4) has been determined from powder X-ray diffraction data by means of the Rietveld method. The structure can be described as being made up of isolated triangles, strontium-oxygen polyhedra, and yttrium-oxygen polyhedra. The yttrium atom has eight-fold coordination. The strontium atoms have 10-, 9- and 8-fold coordination in a covalent matrix. Sr(3)y(2)(BO3)(4):Eu phosphor exhibits a strong red emission around 615 nm because Eu3+ ion locates at a non-centrosymmetric site in the host lattice. In particular, the compound Sr-3(Y0.9Eu0.1)(2)(BO3)(4) has the strongest emission intensity. (C) 2004 Elsevier B.V. All rights reserved.