The Molten Salt Synthesis of (Y1−xEux)4Al2O9 Solid Solution Powders and Their PL Properties

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(Y1−xEux)4Al2O9 solid solution powders can be easily prepared by a simple and convenient method, which effectively combined a molten salt process with a chemical co‐precipitation technique. All the samples were characterized by XRD, SEM, and photoluminescence (PL) spectra techniques. The results show that the incorporation of NaCl salt can greatly promote the formation and crystallization of (Y1−xEux)4Al2O9 crystallites, and lower their synthesizing temperature, and that their particle size and morphology strongly rely on x value, which finally dominates their PL properties. The prominent emission intensity of 5D0→7F2 transition rather than 5D0→7F1 indicates doped Eu3+ cations occupy Y3+ position in monoclinic Y4Al2O9, which is sensitive to Eu3+ local environment, and at x = 0.10, there exist a maximum PL intensity due to the concentration quenching effect.