Emission Enhancement and Energy Transfers in YV(0.5)P(0.5)O(4) Nanoparticles Codoped with Eu(3+) and Bi(3+) Ions

[Image: see text] In this study, solid-state solutions of yttrium orthovanadate-phosphate with varying concentrations of codopants (Eu(3+), Bi(3+)) have been obtained via coprecipitation. An ionic radii mismatch between V(5+) and P(5+) substituents is manifested in broad XRD lines. The sharpening of the XRD lines is observed with increasing bismuth ions concentration in the Eu(3+) codoped YV(0.5)P(0.5)O(4) matrix. The difference in the number of the Stark components for the (5)D(0) → (7)F(J) transitions indicates changes in the lattice and a number of possible Eu(3+) sites. A thorough, systematic spectroscopic analysis of YV(0.5)P(0.5)O(4): x mol % Eu(3+), y mol % Bi(3+) was conducted at room temperature and 5 K. Metal-to-metal energy transfers occurring between Eu(3+), V(5+), and Bi(3+) optically active ions have been investigated. Additionally, efficiency of the Bi(3+)-Eu(3+) energy transfer (ET) was calculated.