This work is concerned with the search for new luminescent materials emitting in the orange-red color. We have synthesized YPO doped with Gd0.25% and/or Eu0.50% by hydrothermal method and YPO doped with Sm0.25% and/or Eu0.50% 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 (RE) in the crystallographic structure of matrices. Weak Eu emission is detected from YPO:Gd, Eu under excitation at 273 nm. Sm levels were detected in excitation spectrum of YPO:Sm, Eu monitoring Eu principal emission at 618 nm. Excited states lifetimes of Gd and Sm sensitizers (S) decrease from mono-doped to co-doped matrices indicating an Energy transfers (ET) from S to Eu with a rate higher than 19%.
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