This work is concerned with the search for new luminescent materials emitting in the orange-red color. We have synthesized YPO4 doped with Gd3+0.25% and/or Eu3+0.50% by hydrothermal method and YP3O9… Click to show full abstract
This work is concerned with the search for new luminescent materials emitting in the orange-red color. We have synthesized YPO4 doped with Gd3+0.25% and/or Eu3+0.50% by hydrothermal method and YP3O9 doped with Sm3+0.25% and/or Eu3+0.50% by ultraphosphate decomposition reaction. Phase purity was checked by FTIR and XRD. Excitation and emission spectra and fluorescence decay measurements were recorded at room temperature (RT). Emission spectra allow to determine the site symmetry of rare earth (RE3+) in the crystallographic structure of matrices. Weak Eu3+ emission is detected from YPO4:Gd3+, Eu3+ under excitation at 273 nm. Sm3+ levels were detected in excitation spectrum of YP3O9:Sm3+, Eu3+ monitoring Eu3+ principal emission at 618 nm. Excited states lifetimes of Gd3+ and Sm3+ sensitizers (S) decrease from mono-doped to co-doped matrices indicating an Energy transfers (ET) from S to Eu3+ with a rate higher than 19%.