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Fabrication and photoluminescent characteristics of La2O3:Eu3+ nanowires
Lixin Yu1, Hongwei Song, Zhongxin Liu
1Key Laboratory of Excited State Physics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 16 Eastern Nan-Hu Road, Changchun 130033, P. R. China.
Abstract:
One-dimensional La(2)O(3):Eu(3+) nanowires (NWs) and sub-micrometer samples (SMs) were fabricated by a hydrothermal method. Their photoluminescent characteristics were studied and compared. The results indicated that the exciton band in NWs blue-shifted in contrast to SMs. In comparison with the charge transfer (CT) band, the relative intensity of the exciton band in NWs was lower than that in SMs, which was attributed to the more energy transfer from the exciton band to surface defects. Frequency-selective-excitation spectra indicated that there existed three symmetry sites of Eu(3+) ions in NWs and two sites in SMs. The results of the temperature dependence of (5)D(1)-(7)F(2) lifetimes indicated that the electronic radiative rate of (5)D(1)-Sigma(7)F(J) in the two samples had hardly any variation and the nonradiative transition rate of (5)D(1)-(5)D(0) in NWs increased slightly.
