Enhanced Luminescence in the SrMgAl ₁₀ O ₁₇ : Eu ²⁺ Blue Phosphor Prepared by a Hybrid Urea‐Sol Combustion Route

A phase‐pure and high‐brightness blue phosphor, Eu ²⁺ doped SrMgAl ₁₀ O ₁₇ ( SAM ), was synthesized through a hybrid urea‐sol combustion route. The structure, photoluminescence spectra, and thermal stability of the SAM were investigated in this work. The phosphor had a homogeneous and rod‐like microstructure, showing a broad emission band centered at 465 nm under the 330 nm excitation. The concentration for luminescence quenching of SAM : Eu ²⁺ occurred at 10 mol%, which doubled that of the phosphor prepared by the conventional combustion method. Compared with the traditional combustion method, the hybrid route led to improvements in luminescence by 52.2%, external quantum efficiency by 16.2%, and thermal stability by 8.8% at 435 K. The blue phosphor prepared by the new method could thus be potentially used with near ultraviolet light‐emitting diodes.