The intense red-emitting phosphor AgEu(MoO4)2 was prepared by using a sol-gel method. The crystallization process of the precursors was characterized by using a thermogravimetry-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD). The size distribution and the shape of the phosphors were characterized by using a field emission scanning electron microscopy (FE-SEM). The samples obtained by using the sol-gel method had a smaller size, a more regular shape and a narrower particle size distribution than those obtained by using the solid-state method. The photoluminescent excitation spectrum of the AgEu(MoO4)2 phosphor is different from there of other double molybdates AEu(MoO 4)2 (A = alkali metal ions) phosphors and its strongest absorption is located at 465-nm. The phosphor AgEu(MoO4)2 shows a strong red emission at 616 nm under excitation of 465 nm blue light, which matches well with commercial blue-light-emitting diodes (LEDs); thus, it is an excellent red phosphor candidate for white LEDs with blue light chips.
- Light-emitting diodes
- Red phosphors