Re-dispersion and film formation of GdVO4 :  Ln3+ (Ln3+ = Dy3+, Eu3+, Sm3+, Tm3+) nanoparticles: particle size and luminescence studies

Dalton Transactions : an International Journal of Inorganic Chemistry
N Shanta SinghRajesh Kumar 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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Oct 30, 2015·Colloids and Surfaces. B, Biointerfaces·Yue LiuGui-Xiang Du
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Feb 28, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Hong-Ping XiaoYong Huang
Oct 9, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Sergio ObregónGerardo Colón
Jun 19, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Nuria O NuñezManuel Ocaña
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