TY  - JOUR
ID  - SisLab1799
UR  - https://eprints.uet.vnu.edu.vn/eprints/id/eprint/1799/
IS  - 9
A1  - T., L. Phan
A1  - Do, Ngoc Chung
A1  - Pham, Duc Thang
A1  - S., C. Yu
Y1  - 2015///
N2  - 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 ³83 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 = 5­10 min (corresponding to d ? 25­40 nm) offer strongest PL intensity at ³611 nm (due to the electronic transition 5 D0 ¼ 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.
JF  - Materials transactions
VL  - 56
TI  - Crystal Structure and Photoluminescence Properties of Eu-Doped Y2O3 Nanoparticles Prepared by Mechanical Milling
AV  - none
ER  -