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Nanoparticles of YPO4:Eu3+, YPO4:Eu3+:Ce3+, YPO4:Tb3+, and YPO4:Ce3+:Tb3+ with different amount of Eu3+ or Tb3+ dopant ions were synthesized by a hydrothermal route. Particle structures and morphologies were investigated and it was found that the increase of Eu3+ or Tb3+ ions, and co-doping with Ce3+ ions resulted in a transition of the crystal structure from tetragonal to hexagonal phase. The phase...
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