Fabrication of Eu 3+ -doped ZnO nanoparticles by laser ablation in liquid medium is reported. Sintered disks made of mixed powders of ZnO and Eu 2 O 3 are used for targets, and surfactant of sodium dodecyl sulfate or LiOH is included in solution. Round-shaped nanoparticles with the diameter of 5∼30 nm are synthesized. When the ZnO host is photoexcited, broad green photoluminescence (PL) of oxygen vacancies in the ZnO host as well as red PL of Eu 3+ is observed at room temperature. The red PL peak of Eu 3+ included in the ZnO host lattice is different from that of the source material of Eu 2 O 3 . Energy transfer from the ZnO host to Eu 3+ is demonstrated in site-selectively excited PL spectra and its excitation spectra. This result shows that the liquid-phase laser ablation is useful for doping active centers into nanoparticles.
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