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The luminescence enhancement of Eu3+ ion and SnO2 nanocrystal co-doped sol–gel SiO2 films |
| Zhang Xiao-Wei(张晓伟), Lin Tao(林涛), Xu Jun(徐骏)†, Xu Ling(徐岭), and Chen Kun-Ji(陈坤基) |
| National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering and School of Physics, Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Nanjing University, Nanjing 210093, China |
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Abstract SnO2 nanocrystal and rare-earth Eu3+ ion co-doped SiO2 thin films are prepared by sol-gel and spin coating methods. The formation of tetragonal rutile structure SnO2 nanocrystals with a uniform distribution is confirmed by X-ray diffraction and transmission electron microscopy. Fourier transform infrared spectroscopy is used to investigate the densities of the hydroxyl groups, and it is found that the emission intensity from the 5D0-7F2 transitions of the Eu3+ ions is enhanced by two orders of magnitude due to energy transfer from the oxygen-vacancy-related defects of the SnO2 nanocrystals to nearby Eu3+ ions. The influences of the amounts of Sn and the post-annealing temperatures are systematically evaluated to further understand the mechanism of energy transfer. The luminescence intensity ratio of Eu3+ ions from electric dipole transition and magnetic dipole transition indicate the different probable locations of Eu3+ ions in the sol-gel thin film, which are further discussed based on temperature-dependent photoluminescence measurements.
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Received: 22 July 2011
Revised: 05 September 2011
Accepted manuscript online:
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PACS:
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81.20.Fw
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(Sol-gel processing, precipitation)
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78.40.Fy
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(Semiconductors)
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78.55.-m
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(Photoluminescence, properties and materials)
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61.46.Hk
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(Nanocrystals)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61036001), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2010010), and the Fundamental Research Funds for the Central Universities of China (Grant No |
Cite this article:
Zhang Xiao-Wei(张晓伟), Lin Tao(林涛), Xu Jun(徐骏), Xu Ling(徐岭), and Chen Kun-Ji(陈坤基) The luminescence enhancement of Eu3+ ion and SnO2 nanocrystal co-doped sol–gel SiO2 films 2012 Chin. Phys. B 21 018101
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