Structure and Photoluminescent Properties of Microstructural YBO₃ : Eu³⁺ Nanocrystals

Authors: Pan, Guohui; Song, Hongwei; Yu, Lixin; Liu, Zhongxin; Bai, Xue; Lei, Yanqiang; Fan, Libo; Lu, Shaozhe; Ren, Xinguang

Source: Journal of Nanoscience and Nanotechnology, Volume 7, Number 2, February 2007 , pp. 593-601(9)

Publisher: American Scientific Publishers

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Abstract:

YBO₃ : Eu³⁺ nanocrystals (NCs) were prepared by a hydrothermal method and characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy. The results demonstrate that morphology and structure of the NCs varied strongly with hydrothermal temperature. Their luminescent properties were investigated in comparison to the bulk. A large number of NO^&minus₃ groups were adsorbed at the surface of hydrothermal products, which acted as luminescent killers; Two symmetry sites of Eu³⁺ ions in NCs, the interior and the surface sites, were identified by the site-selective excitation and time-resolved emission experiments; The intensity ratio of ⁵D₀-⁷F₂ to ⁵D₀-⁷F₁ of Eu³⁺ at the surface site increased greatly than that at the interior site; as a result, the chromaticity was improved; The total radiative transition rate of ⁵D₀-Σ_J⁷F_j for Eu³⁺ at the surface site was 3-5 times larger than that at the interior.

Keywords: BORATE; RARE EARTH; MICROSTRUCTURE; LUMINESCENCE; ELECTRONIC TRANSITION RATE

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2007.133

Publication date: 2007-02-01

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