Novel double‐perovskite Mg2InSbO6:Sm3+ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

Abstract In this study, Sm 3+ ‐doped double‐perovskite Mg 2 InSbO 6 phosphors were synthesized via high‐temperature solid‐state reaction. Mg 2 InSbO 6 belongs to the double‐perovskite family with a space group of R (No.148). The photoluminescence (PL) spectrum illustrates that Mg 2 InSbO 6 :0.05Sm 3+ phosphor can emit intense orange‐red emission light at 607 nm due to the 4 G 5/2 → 6 H 7/2 transition. The optimum concentration of Mg 2 InSbO 6 : x Sm 3+ is confirmed to 0.05 mol. The asymmetric ratio ( 4 G 5/2 → 6 H 9/2 / 4 G 5/2 → 6 H 5/2 ) of Mg 2 InSbO 6 :0.05Sm 3+ phosphor is 2.73. The quenching temperature exceeds 500 K, illustrating that Mg 2 InSbO 6 :Sm 3+ sample has excellent heat resistance. The high color purity and correlated color temperature (CCT) of Mg 2 InSbO 6 :Sm 3+ phosphors are obtained. Furthermore, a white light‐emitting diode (w‐LED) is successfully fabricated, possessing CCT of 6769 K and high color rendering index ( R a ) of 89. Therefore, the orange‐red‐emitting Mg 2 InSbO 6 :Sm 3+ phosphors exhibit great potential to apply in solid‐state lighting fields.