With narrow red photoluminescence (PL) bands, tetravalent Mn⁴⁺ doped phosphors show promising prospect in commercial application to effectively expand color gamut of phosphor converted LED displays. Here, we report a type of Sr_2–zMg_1+yY_zAl_22–xO₃₆:xMn⁴⁺ phosphors with regular cage-like micro-spherical morphologies. The micron size spherical precursors were synthesized with a propylene oxide (PO) driven fast sol–gel method. The cage -like spherical morphology is beneficial to efficiently trapping much incident light to enhance the PL of the phosphors. Being calcined at 1300 ^°C, Sr₂MgAl_21.978O₃₆:0.022Mn⁴⁺ only exhibits the internal quantum efficiency (IQE) of 24.91%. With the Mg²⁺-Mn⁴⁺ codoping and Y³⁺/Sr²⁺ substituting strategies, to fulfill charge balance and produce John-Teller distortion, IQE of Sr_2–zMg_1+yY_zAl_22–xO₃₆:xMn⁴⁺ can be further improved up to 36.45%. The CIE color coordinates of Sr_2–zMg_1+yY_zAl_22–xO₃₆:xMn⁴⁺ under near ultraviolet excitation can be stably fixed to (0.723, 0.227) at deep red region. It thus finds a potential application as pc-LED display with much broader color gamut than that of the NTSC standard. Therefore, Sr_2–zMg_1+yY_zAl_22–xO₃₆:xMn⁴⁺ micron size spheres can be employed as promising red phosphors for high performance LED displays.

^{四价Mn 4+}掺杂荧光粉具有较窄的红色光致发光(PL)带，在有效扩展荧光粉转换LED显示器的色域方面具有广阔的商业应用前景。在这里，我们报告了一种具有规则笼状微球形形态的 Sr _{2– z} Mg _{1+ y} Y _z Al _{22– x} O ₃₆ : x Mn ^{4+荧光粉。}微米尺寸的球形前体是用环氧丙烷 (PO) 驱动的快速溶胶-凝胶法合成的。笼状球形形态有利于有效捕获大量入射光以增强荧光粉的PL。1300  ^°煅烧C，Sr ₂ MgAl _21.978 O ₃₆ :0.022Mn ⁴⁺仅表现出24.91%的内量子效率（IQE）。采用Mg ²⁺ -Mn ⁴⁺共掺杂和Y ³⁺ /Sr ²⁺取代策略，实现电荷平衡并产生John-Teller畸变，Sr _{2– z} Mg _{1+ y} Y _z Al _{22– x} O ₃₆的IQE ：× Mn ⁴⁺可进一步提高至36.45%。_{Sr 2– z} Mg _{1+ y} Y的 CIE 颜色坐标_z Al _{22– x} O ₃₆ : x Mn ⁴⁺在近紫外激发下可在深红色区域稳定固定在(0.723, 0.227)。因此，它发现了作为具有比 NTSC 标准更广色域的 pc-LED 显示器的潜在应用。因此，Sr _{2– z} Mg _{1+ y} Y _z Al _{22– x} O ₃₆ : x Mn ⁴⁺微米尺寸的球体可用作高性能LED显示器的有前途的红色荧光粉。