Solid-state reaction, co-precipitation, and sol-gel procedures were used to synthesize the Sr3Y1.95Ge3O12:0.05Eu3+ (SYGO: Eu3+) garnet structure. The morphological structure and photoluminescence properties of the samples were studied. Phosphors have morphologies and particle sizes that vary depending on the preparation. According to the X-ray diffraction pattern measurement, the sol-gel sample only appeared to exhibit the SYGO: Eu3+ characteristic that it shows the cubic structure belonging to the Ia3d (230) space group. In comparison to the two approaches of co-precipitation and solid-phase reaction, the sol-gel method has a more single-phase structure. Under the excitation wavelength of 395 nm, all produced samples emitted red light, with the greatest emission peak at 612 nm, corresponding to the 5D0→7F2 transition of Eu3+ ions in the SYGO host lattice. The color coordinates of the sample SYGO: Eu3+ fabricated by the sol-gel method are x = 0.65 and y = 0.35. Therefore, the SYGO: Eu3+ based on sol-gel method’s synthesis is a promising phosphor for the application of White LED.
