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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 Gd0.96Eu0.04(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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