Coactivation of α-Sr(PO₃)₂ and SrM(P₂O₇) (M = Zn, Sr) with Eu²⁺ and Mn²⁺

The phosphates α-Sr(PO 3 ) 2, SrZn(P 2 O 7 ), and α-Sr 2 (P 2 O 7 ) were doped and codoped with Eu 2+ and Mn 2+, structurally characterized, and analyzed by fluorescence spectroscopy. α-Sr(PO 3 ) 2 was found to enable the energy transfer between Eu 2+ and Mn 2+, leading to a new phosphor emitting at 404 and 625 nm and giving white light under excitation at 323 nm. In SrZn(P 2 O 7 ) and α-Sr 2 (P 2 O 7 ), the codoping was also successful but the luminescence intensity of the red emission was found to be less intense. Moreover, the crystal structure of SrZn(P 2 O 7 ) has been determined based on single-crystal data ( P 2 1 / n, Z = 4, a = 531.43(2) pm, b = 820.80(3) pm, c = 1272.50(6) pm, β = 90.192(4)°, R1 = 0.035, and wR2 = 0.070).