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Key Laboratory of Excited State Physics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 16 Eastern Nan-Hu Road, Changchun, P. R. China
; Fax: 86-431-6176320
Phys. Chem. Chem. Phys., 2006,8, 303-308
25 Aug 2005,
03 Oct 2005
First published online
09 Nov 2005
One-dimensional La2O3:Eu3+ 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 Eu3+ ions in NWs and two sites in SMs. The results of the temperature dependence of 5D1–7F2 lifetimes indicated that the electronic radiative rate of 5D1–∑7FJ in the two samples had hardly any variation and the nonradiative transition rate of 5D1–5D0 in NWs increased slightly.
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