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Effect of Surface-Absorbing Chemical Groups on the Luminescence of Yb3+/Er3+ Co-Doped Nanosized Y2O3

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Er3+/Yb3+ co-doped nanocrystal Y2O3 powders with different sizes were prepared by using a chemical auto-combustion reaction. X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were used to characterize the crystal structure and morphology of the samples. Fourier transform infrared (FT-IR) spectra showed that the surfaces of smaller particles absorbed a larger amount of NO 3, CO2− 3 and OH groups. These chemical groups caused an increase of the population ratios of the 4I13/2 level to the 4I11/2 level when the particle size decreased, thus resulting in a change of the red-green upconversion emission intensity ratio under 980 nm excitation. The 1.5 μm emission intensity also changed with the particle size. These results suggest that surface status is an important factor influencing the luminescent properties of nanosized materials and that surface modification is needed in order to obtain the satisfied materials.
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Keywords: NONRADIATIVE RELAXATION; SURFACE; UPCONVERSION; Y2O3:YB3+/ER3+

Document Type: Research Article

Publication date: 2010-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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