Enhancement of luminescence of YPO_4:Eu~(3+),Yb~(3+) nanophosphor synthesized by hydrothermal method

摘要

YPO_4 nanowires (NWs) and nanoparticles (NPs) have been synthesized by hydrothermal methods respectively in the absence and presence of EDTA. The Eu~(3+) and Yb~(3+) codoped YPO_4 NWs and NPs prepared directly from hydrothermal systems show efficient red down-conversion luminescence (DL) and upconversion luminescence (UL) at room temperature without further annealing process. EDTA plays a critical role in controlling the morphologies of YPO_4 nanocrystals in hydrothermal systems and enhances both the DL and UL intensities of Eu~(3+) by the factor of 100%. Monodispersed Eu~(3+) and Yb~(3+) codoped YPO_4 NPs will be a new candidate for application in infrared displays and biological labels.