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In this study, Sm3+‐doped double‐perovskite Mg2InSbO6 phosphors were synthesized via high‐temperature solid‐state reaction. Mg2InSbO6 belongs to the double‐perovskite family with a space group of R (No.148). The photoluminescence (PL) spectrum illustrates that Mg2InSbO6:0.05Sm3+ phosphor can emit intense orange‐red emission light at 607 nm due to the 4G5/2→6H7/2 transition. The optimum concentration...