Analysis of the Structure and Luminescence Properties of Sr3Y2Ge3O12:0.05Eu3+ (SYGO:Eu3+) According to Judd–ofelt Theory

In this report, SYGO:Eu3+ red phosphor have been successfully synthesized by sol-gel method. The X-ray diffraction results show that the sample has a cubic crystal structure, belonging to the space group Ia3d (230) without any doping. Scanning electron microscopy (FE-SEM) combined with EDS was performed to determine the microstructure and elemental composition of the fabricated phosphor. The particles are significantly agglomerated and are about ∼200 nm in size. The results of fluorescence property investigation (PLE-PL) show that, the maximum emission spectrum at 612 nm under ultraviolet light close to 395 nm for excitation. Calculating the J-O intensity parameters, the result is that Ω2 is larger than Ω4 which proves that the surrounding local structure of the doped ion is asymmetric. In addition, the luminescence efficiency approximately calculation is 70%. Phosphor SYGO:Eu3+ has been fabricated which can be used as a solid lighting material for WLED.