Effect of Sintering Time on Luminescent Properties of YAG: Ce3+ Phosphors

摘要

Phosphors of yttrium aluminium garnet activated by cerium ion, a kind of yellow luminescent materials for white LED lighting, were synthesized via solid-state reaction route in air and then reducing atmospheres.Thermal analysis was conducted by DTA/TGA.Moreover, XRD patterns of phosphors show that pure cubic phase of Y3 Al5 O12 is formed.Microstructures of the powders were observed by SEM.Luminescent spectra of the phosphors were also characterized by a spectrophotometer.The effect of sintering time on excitation and emission properties of the YAG: Ce3+ powders were systematically studied, resulting a best range of sintering time, 300 ～ 400 min, for maximal relative luminescent intensity.