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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 11
BKCSDE 29(11)
November 20, 2008

Title	Nanostructures and Photoluminescence Properties of Gd₂O₃:Eu Red-Phosphor Prepared via Hydrothermal Route
Author	Kyung Hee Lee, Yun Jeong Bae, Song Ho Byeon*
Keywords	Phosphor, Nanostructure, Hydrothermal reaction, Photoluminescence
Abstract	Various nanostructures (nanorods, nanowires, nanotubes, nanospheres) of Gd_0.96Eu_0.04(OH)₃ have been prepared by hydrothermal reactions at different pHs and temperatures. The aspect ratios of one-dimensional nanostructures are strongly dependent on the solution pH. Subsequent dehydrations of these hydroxides at higher than 500 oC lead to the formation of Gd₂O₃:Eu phosphors with different nanostructures. Interestingly, the shapes of nanorod and nanowire obtained under hydrothermal pressures are retained after the structural transformation from hexagonal Gd(OH)₃:Eu to cubic Gd₂O₃:Eu at high temperatures. Gd₂O₃:Eu nanowires can grow up to 20-30 nm in diameter and several tens of micrometers in length. In contrast, the nanotube structure of Gd(OH)₃:Eu is collapsed to produce the spherical Gd₂O₃:Eu nanoparticles after dehydration process. A significant change of morphology induced by an adjustment of pH of the initial solution for hydrothermal synthesis of Gd(OH)₃:Eu strongly affect the photoluminescence efficiency of Gd₂O₃:Eu phosphor. The relative emission intensity of Gd₂O₃:Eu is reduced with increasing the aspect ratio of nanoparticles, the weakest emission being observed with nanowires of the highest aspect ratio.
Page	2161 - 0
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