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-ΣJ7Fj 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: 10.1166/jnn.2007.133
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