Novel Mn4+-doped magnetoplumbite-related aluminate X-type Ca2Mg2Al28O46 and W-type CaMg2Al16O27 red phosphors were synthesized by solid-state reaction, and we investigated their photoluminescence properties. X-type Ca2Mg2Al28O46:Mn4+ and W-type CaMg2Al16O27:Mn4+ exhibited red photoluminescence, with peaks at 655 and 656 nm, arising from the spin-forbidden 2E→4A2 transition of Mn4+ under near-ultraviolet and blue light excitation, respectively. Therefore, these red phosphors can be excited by near ultraviolet or blue LED light. The photoluminescence properties of these phosphors were similar because magnetoplumbite-related structures crystallize similarly, forming structures consisting of stacked S and R blocks. From these results, we confirmed that magnetoplumbite-related compounds can act as the host structure for Mn4+-doped phosphors.
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