@article{SisLab1799,
          volume = {56},
          number = {9},
           title = {Crystal Structure and Photoluminescence Properties of Eu-Doped Y2O3 Nanoparticles Prepared by Mechanical Milling},
          author = {L. Phan T. and Ngoc Chung Do and Duc Thang Pham and C. Yu S.},
            year = {2015},
           pages = {1142},
         journal = {Materials transactions},
             url = {https://eprints.uet.vnu.edu.vn/eprints/id/eprint/1799/},
        abstract = {We have used a top-down approach of the mechanical milling to fabricate Y2O3:Eu3+ nanoparticles (NPs), and then studied their crystal structure and photoluminescence (PL) properties based on X-ray diffraction (XRD), electron paramagnetic resonance (EPR) and PL spectroscopy. XRD results revealed that the change of the milling time (tm) from 0 to 540 minutes (min) decreased the average crystallite size (d) of NPs from ?83 nm (for tm = 0 min) to below 3.5 nm (for tm = 540 min). This varied lattice strain and defects, and caused the structural changes, which influenced directly the PL properties of NPs. Among the fabricated NP samples, those with tm = 5?10 min (corresponding to d {\ensuremath{\mu}} 25?40 nm) offer strongest PL intensity at ?611 nm (due to the electronic transition 5 D0 ? 7 F2). The increase of the longer milling time (i.e., lowering d) reduces quickly the intensity of this emission, but slightly increased the intensity of auxiliary emissions. The nature of the observed phenomena was discussed.}
}