Phase transition, structure and luminescence of Eu:YAG nanophosphors by co-precipitation method

The methods to synthesize Eu:YAG phosphor by co-precipitation method and solid-state synthesis were compared. The dynamic aspects of the phase transition of Eu:YAG precursor synthesized by co-precipitation method were studied by using X-ray diffraction, infrared and Raman spectroscopy. The results showed that the precursor transformed to pure-YAG phase at the sintering temperature of 900 °C without intermediate phases present. Transmission electron microscope for the precursor powders sintered at 900–1200 °C showed that the powders were well-dispersed and had average size about 50–100 nm.The fluorescence spectra showed that the Eu:YAG phosphors had strong photoluminescence. The luminescence properties of the sintered powders depend on the sintering temperature were also analyzed.