Effective fabrication of lanthanide activated phosphors and photoluminescence studies

Reactions under hydrothermal conditions between lanthanide ions and different loading hosts (phosphates, vanadates and molybdates) lead to a group of rare earth-based solid state materials. As for the cases of phosphates and vanadates, a novel self-sacrificing template route with ultrasonic assisted hydrothermal treatments has been utilized. The emission intensities of building blocks derived from yttrium (YPO 4 :Eu 3+ and YVO 4 :Eu 3+ ) were significantly stronger than their counterparts (GdPO 4 :Eu 3+ and GdVO 4 :Eu 3+ ). Ultrasonic irradiation of reaction solution ahead of hydrothermal treatments would also improve their red luminescence. In the case of molybdates , red/green emissive phosphors (BaMoO 4 : Eu 3+ and BaMoO 4 : Tb 3+ ) were achieved in the presence of polyaspartic acid as the template. Their structures and photophysical features have been investigated in detail.