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R: Sr and Ba) Phosphors. -M 3P4O13:xBi 2+ (M: Sr, Ba; x = 0-4 mol%) are prepared by sintering stoichiometric mixtures of SrCl 2 (BaCl2), NH4H2PO4, and Bi2O3 in air (alumina crucible, 1. 300 C, 2 h, 2. 850 C, 2 h). The compounds has a layered structure (triclinic, space group P1, Z = 2, powder XRD) containing MO7 polyhedra and P 4 anions composed of four PO4 tetrahedra. Their excitation bands show peaks at 440 nm matching the blue LED chip and at 658 and 686 nm owing to the 2 P3/2 2 P1/2 transition of the Bi dopant. The optimum Bi level is 3.0 mol%. Decay curves and time-resolved spectra confirm that the phosphors have only a single Bi 2+ center. The phosphors are discussed as potential red emitting candidates for white LEDs. -(CAO*, R.; CAO, Y.; FU, T.; JIANG, S.; LI, W.; LUO, Z.; FU, J.; J. Alloys Compd. 661 (2016) 77-81, http://dx.