Novel double‐perovskite Mg <sub>2</sub> InSbO <sub>6</sub> :Sm <sup>3+</sup> phosphor with excellent heat‐resistant performance and high color purity used in white LEDs
Yuanyuan Liu, Wen Shi, Dongliang Liao, Xiongyu Yang, Jing Gao, Zhijiang Ma, Jiang Guo, Ning Gong, Lu Liu, Mingxin Chang, Bin Deng, Ruijin Yu
Abstract
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.