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A new mixed-anion phosphate crystal Cs 2 Bi 2 Sr(P 2 O 7)(PO 4) 2 was obtained by molten salt method. Single-crystal X-ray diffraction data demonstrated that the compound crystallizes in monoclinic space group P 2 1 /c (No.14) with unit cell parameters a ​= ​17.708(10) Å, b ​= ​9.156(5) Å and c ​= ​9.221(5) Å, β ​= ​90.160(8) °. The structure exhibits a novel three-dimensional network, which is made up of BiO 6 , BiO 5 , SrO 6 and CsO 11 polyhedra sharing the corners with PO 4 tetrahedra and P 2 O 7 diphosphate groups. The band gap was estimated by the combined density functional theory and experimental study. Photoluminescence property of Cs 2 Bi 2- x Sr(P 2 O 7)(PO 4) 2 : x Eu3+ showed the excellent thermal stability and high quantum efficiency. The structure of a new mixed-anion phosphate Cs 2 Bi 2 Sr(P 2 O 7)(PO 4) 2 , belonging to a rare case with twinning structure, is herein reported. And the photoluminescence of Eu3+ doped Cs 2 Bi 2 Sr(P 2 O 7)(PO 4) 2 shows high quantum efficiency (92%). Image 1 • The structure of Cs 2 Bi 2 Sr(P 2 O 7)(PO 4) 2 (CBSP) exhibits rare twin structure. • The new CBSP crystals were firstly obtained using molten salt method. • The CBSP:0.25Eu3+ shows excellent thermal stability and high quantum efficiency. [ABSTRACT FROM AUTHOR]