Inorganic luminescent materials hold great promise for optoelectronic device applications, yet the limited efficiency and poor thermal stability of oxide-based deep-red emitting phosphors hinder the advancement of plant lighting technologies. Herein, a simple compositional engineering strategy is proposed to stabilize the phase, boost external quantum efficiency (EQE) and enhance thermal stability. The chemical modification of the PO₄ tetrahedron in NaMgPO₄:Eu by incorporating SiO₄ lowers the formation energy, leading to the generation of pure olivine phase and increasing the EQE from 27% to 52%, setting a record for oxide deep-red phosphors. In parallel, the introduced deep defect level improves thermal stability at 150 °C from 62.5% to 85.4%. Besides, the excitation and emission peaks shifted to 440 nm and 675 nm, respectively, aligning precisely with the specific spectral absorption requirements of plant phytochromes. Moreover, the luminescent intensity showed nearly no decay after being exposed to 80% relative humidity and 80 ^oC for 6 h, and the pc-LED utilizing Na_1.06MgP_0.94Si_0.06O₄:Eu achieves a high output power of 780 mW at 300 mA. Our research demonstrates a facile method for optimizing the performance of inorganic luminescent materials and provides alternative solutions for low-cost plant lighting.

无机发光材料在光电器件应用中前景广阔，但氧化物基深红荧光粉的有限效率和较差的热稳定性阻碍了植物照明技术的进步。在此，提出了一种简单的成分工程策略来稳定相位、提高外部量子效率 （EQE） 并增强热稳定性。通过掺入 SiO₄ 对 NaMgPO₄：Eu 中的 PO₄ 四面体进行化学改性，降低了形成能，导致产生纯橄榄石相，并将 EQE 从 27% 提高到 52%，创下了氧化物深红色荧光粉的记录。同时，引入的深缺陷水平将 150 °C 时的热稳定性从 62.5% 提高到 85.4%。此外，激发峰和发射峰分别移动到 440 nm 和 675 nm，与植物植物色素的特定光谱吸收要求完全一致。此外，在 80% 相对湿度和 80 ^°C 下暴露 6 小时后，发光强度几乎没有衰减，使用 Na_1.06MgP_0.94Si_0.06O₄：Eu 的 pc-LED 在 300 mA 下实现了 780 mW 的高输出功率。我们的研究展示了一种优化无机发光材料性能的简单方法，并为低成本植物照明提供了替代解决方案。