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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
 
Creator SHARMA, A
DHAR, S
SINGH, BP
KUNDU, T
SPASOVA, M
FARLE, M
 
Subject Semiconductors
Sol-gel
Impurities
Surface groups
Optoelectronics
OPTICAL-PROPERTIES
QUANTUM DOTS
EMISSION
NANOCRYSTALS
DEFECTS
FILMS
 
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.
 
Publisher SPRINGER
 
Date 2014-10-15T08:33:22Z
2014-10-15T08:33:22Z
2012
 
Type Article
 
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
 
Language en