Title |
Re-dispersion and film formation of GdVO 4 : Ln 3+ (Ln 3+ = Dy 3+ , Eu 3+ , Sm 3+ , Tm 3+ ) nanoparticles : particle size and luminescence studies
|
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Published in |
Dalton Transactions: An International Journal of Inorganic Chemistry, February 2012
|
DOI | 10.1039/c2dt12190e |
Pubmed ID | |
Authors |
N. Shanta Singh, R. S. Ningthoujam, Ganngam Phaomei, S. Dorendrajit Singh, A. Vinu, R. K. Vatsa |
Abstract |
GdVO(4) : Ln(3+) (Ln(3+) = Dy(3+), Eu(3+), Sm(3+), Tm(3+)) nanoparticles are prepared by a simple chemical route at 140 °C. The crystallite size can be tuned by varying the pH of the reaction medium. Interestingly, the crystallite size is found to increase significantly when pH increases from 6 to 12. This is related to slower nucleation of the GdVO(4) formation with increase of VO(4)(3-) present in solution. The luminescence study shows an efficient energy transfer from vanadate absorption of GdVO(4) to Ln(3+) and thereby enhanced emissions are obtained. A possible reaction mechanism at different pH values is suggested in this study. As-prepared samples are well dispersed in ethanol, methanol and water, and can be incorporated into polymer films. Luminescence and its decay lifetime studies confirm the decrease in non-radiative transition probability with the increase of heat treatment temperature. Re-dispersed particles will be useful in potential applications of life science and the film will be useful in display devices. |
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