Accurate light irradiation towards phytochrome has been considered as a key method to improve the efficiency of plant cultivation. In this work, a series of far red-emitting Mn⁴⁺-activated SrGd₂Al₂O₇(SGAO) phosphors were synthesized by high temperature solid-state reaction. Under excitation at 330 nm, the optimized SGAO:0.1%Mn⁴⁺ phosphor exhibits intense far-red emission in narrow range of 701–740 nm, which matches well with the absorption of phytochrome P_FR and excludes from that of the phytochrome P_R. Moreover, the SGAO:0.1%Mn⁴⁺ sample exhibits considerable thermal quenching of far-red emission towards temperature, the emission intensity around 719 nm at 423 K was approximately 33% of that at room temperature. Also, the crystal field strength D_q, the Racah parameters B and C, and the nephelauxetic ratio β₁ of SGAO: Mn⁴⁺ were calculated and discussed. The results provide a reference for developing new high-efficient far-red-emitting phosphor towards indoor plant growth LEDs.

对光敏色素进行精确的光照射已被认为是提高植物栽培效率的关键方法。在这项工作中，通过高温固相反应合成了一系列远红光发射 Mn ⁴⁺激活的 SrGd ₂ Al ₂ O ₇ (SGAO) 荧光粉。在 330 nm 激发下，优化的 SGAO:0.1%Mn ⁴⁺荧光粉在 701-740 nm 的窄范围内表现出强烈的远红光发射，这与光敏色素 P _FR的吸收很好地匹配，并排除了光敏色素 P _R的吸收. 此外，SGAO:0.1%Mn ⁴⁺样品表现出相当大的远红光发射对温度的热猝灭，423 K 下 719 nm 附近的发射强度约为室温下的 33%。此外，还计算并讨论了晶体场强D _q、Racah 参数B 和C 以及SGAO: Mn ⁴⁺的散射比β ₁。研究结果为开发新型高效远红光荧光粉用于室内植物生长 LED 提供参考。