Influence of Tb doping on the luminescence characteristics of ZnO nanoparticles
DSpace at IIT Bombay
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Title |
Influence of Tb doping on the luminescence characteristics of ZnO nanoparticles
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Creator |
SHARMA, A
DHAR, S SINGH, BP KUNDU, T SPASOVA, M FARLE, M |
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Subject |
Semiconductors
Sol-gel Impurities Surface groups Optoelectronics OPTICAL-PROPERTIES QUANTUM DOTS EMISSION NANOCRYSTALS DEFECTS FILMS |
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Description |
Structural and optical properties of the Tb-doped ZnO nanoparticles with average diameter approximate to 4 nm have been systematically investigated. Our X-ray diffraction studies show a contraction of the ZnO lattice with the increase of the Tb mole-fraction x for x 0.02, GL results due to the physisorption of certain groups on the surface of the nanoparticles (GL-groups). It is also found that in this Tb mole-fraction regime, Tb incorporates mostly on the surface of the nanoparticles and affects the UVL to GL intensity ratio by influencing the attachment of the GL-groups. However, for x > 0.02, GL originates not only from the GL-groups but also from certain point defects, which are likely to be generated due to the incorporation of Tb in the core of the nanoparticles. A simple rate equation model is introduced to get a quantitative understanding about the variation of the density of the centers responsible for the GL emission as a function of x under the atmospheric and the vacuum conditions.
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Publisher |
SPRINGER
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Date |
2014-10-15T08:33:22Z
2014-10-15T08:33:22Z 2012 |
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Type |
Article
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Identifier |
JOURNAL OF NANOPARTICLE RESEARCH, 14(2)
http://dx.doi.org/10.1007/s11051-011-0676-5 http://dspace.library.iitb.ac.in/jspui/handle/100/14693 |
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Language |
en
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