Photoluminescence and Raman Spectroscopy Studies of Eu(OH)3 Rods at High Pressures

Eu(OH)3 rods, with diameters of 140 nm and lengths of 100−500 nm were prepared by a hydrothermal method. X-ray diffraction indicated a pure hexagonal phase (space group P63/m) of the rods. The relations between structural and optical properties of Eu(OH)3 rods under high pressures were obtained by p...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2010-03, Vol.114 (11), p.4895-4900
Main Authors: Zeng, Q. G, Ding, Z. J, Zhang, Z. M, Sheng, Y. Q
Format: Article
Language:English
Subjects:
C: Nanops and Nanostructures
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Summary:Eu(OH)3 rods, with diameters of 140 nm and lengths of 100−500 nm were prepared by a hydrothermal method. X-ray diffraction indicated a pure hexagonal phase (space group P63/m) of the rods. The relations between structural and optical properties of Eu(OH)3 rods under high pressures were obtained by photoluminescence (PL) and Raman spectra. Two structural phase-transition points at around 4 and 8 GPa were observed in this work. When a pressure of about 4 GPa was applied to the samples, one new emission peak at 593 nm was observed in the PL spectra, indicating the splitting of the 7F1 Stark level in Eu3+ ions. Such a splitting was attributed to the decrease of site symmetry of Eu3+ ions from C 3h to D 2 at high pressures. Two new Raman bands appeared under a pressure up to about 8 GPa due to the pressure-induced amorphization. After the pressure was released, the original PL and Raman spectra were recovered.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp911791u