Luminescent Properties of Pure Cubic Phase Y<sub>2</sub>O<sub>3</sub>/Eu<sup>3+</sup> Nanotubes/Nanowires Prepared by
a Hydrothermal Method
Xue Bai
Hongwei Song
Lixin Yu
Linmei Yang
Zhongxin Liu
Guohui Pan
Shaozhe Lu
Xingguang Ren
Yanqiang Lei
Libo Fan
10.1021/jp050652f.s001
https://acs.figshare.com/articles/journal_contribution/Luminescent_Properties_of_Pure_Cubic_Phase_Y_sub_2_sub_O_sub_3_sub_Eu_sup_3_sup_Nanotubes_Nanowires_Prepared_by_a_Hydrothermal_Method/3272200
One-dimensional pure cubic Y<sub>2</sub>O<sub>3</sub>/Eu<sup>3+</sup> nanocrystals (NCs) were synthesized by a hydrothermal method at
various temperatures. The NCs prepared at 130 °C yielded nanotubes (NTs) with wall thickness of 5−10 nm
and outer diameter of 20−40 nm. The NCs prepared at 170 and 180 °C yielded nanowires (NWs) with
diameters of ∼100 and ∼300 nm, respectively. Their luminescent properties, including electronic transition
processes, local environments surrounding Eu<sup>3+</sup> ions, electron−phonon coupling, and UV light irradiation
induced spectral changes have been systematically studied and compared. The results indicate that the Y<sub>2</sub>O<sub>3</sub>/Eu<sup>3+</sup> NTs and NWs have strong red <sup>5</sup>D<sub>0</sub>−<sup>7</sup>F<sub>2</sub> transitions. The fluorescence lifetime of <sup>5</sup>D<sub>1</sub>−<sup>7</sup>F<sub>1</sub> hardly changes
in different samples, while that of <sup>5</sup>D<sub>0</sub>−<sup>7</sup>F<sub>2</sub> decreases a small amount in Y<sub>2</sub>O<sub>3</sub>/Eu<sup>3+</sup> NTs. The <i><sup>5</sup></i><sup></sup>D<sub>0</sub>−<sup>7</sup>F<sub>2</sub> lines
originate from the emissions of Eu<sup>3+</sup> ions occupying one <i>C</i><sub>2</sub> site, like that in the bulk powders. The phonon
sideline with a frequency shift of 40−50 cm<sup>-1</sup> appears at the low-energy side of the <sup>7</sup>F<sub>0</sub>−<sup>5</sup>D<sub>0</sub> zero phonon
line. The relative intensity of the sideline to zero phonon line increases by varying from NTs to NWs, and
the spectral position of the phonon sideline shifts red. The UV light irradiation induced spectral change in the
charge-transfer band was studied. The results indicate that the spectral change is dependent on sample size
and is wavelength selective. A detailed model was proposed to explain the light-induced spectral change.
2005-08-18 00:00:00
C 2 site
sample size
phonon line
frequency shift
fluorescence lifetime
transition processes
wall thickness
phonon sideline shifts
Luminescent Properties
Eu
phonon line increases
NC
NT
NW
hydrothermal method
phonon sideline
bulk powders
nm
UV light irradiation