Two Cadmium Germanophosphates [CdGe(μ 2 ‐O)(HPO 4 ) 2 ‐ (H 2 O) 2 ] . H 2 O and Anhydrous Cd 7 Ge(PO 4 ) 6 : Syntheses, Crystal Structures and Photoluminescence Properties

Two cadmium germanophosphates (GePOs), namely, [CdGe(μ 2 ‐O)(HPO 4 ) 2 (H 2 O) 2 ] . H 2 O ( 1 ) and anhydrous Cd 7 Ge(PO 4 ) 6 ( 2 ) have been prepared by hydro/solvothermal method. Compound 1 crystallizes in a centrosymmetric (CS) space group P ‐1 with a 2D layer structure, which is composed of 1D [Cd(HPO 4 ) 4 (H 2 O) 2 ] ∞ and [Ge(μ 2 ‐O) 2 (HPO 4 ) 4 ] ∞ infinite chains. Compound 2 crystallizes in a centrosymmetric space group R ‐3 with a complicated 3D network, which is built from CdO 6 octahedra, GeO 6 octahedra and PO 4 tetrahedra. TGA results showed that the structure of anhydrous Cd 7 Ge(PO 4 ) 6 was stable under 800 °C. The luminescent properties of two compounds were also investigated at room temperature. The color coordinate of 2 (0.2613, 0.2649) is close to that of the balanced white‐light emission (0.333, 0.333), which indicates that compound 2 is a good blue light emitted material at room temperature under UV irradiation exaction, thus anhydrous compound 2 might be a potential candidate for blue light‐emitted material.