Abstract
Poly(acrylic acid) (PAA) funtionalized luminescent YVO4:Eu3+ nanocrystals could be successfully prepared by polyol method. The surface functionalization of YVO4:Eu3+ nanocrystal is ascertained from the Fourier transform infrared spectroscopy. Photoluminescence studies confirm the occurrence of resonant energy transfer from vanadate (VO43−) to the excited states of Eu3+ resulting in strong red emission. Luminescent YVO4:Eu3+ nanocrystals shows the selective detection of Cu2+ among various metal ions. The intensity of Eu3+ emission could be reduced to ∼92 % with 9 μM of Cu2+. The behavior of quenching is dominant by dynamic nature. The detection limit could be achieved ∼17 nM. With the calculated decay rate constants, the excited photon migration from Eu3+ to Cu2+ ions is ascertained which leads in quenching of Eu3+ emission. While, from VO43− to Cu2+ is insignificant. Alkaline medium is more sensitive towards Cu2+ detection. This nanocrystal has a response time of ∼7 min.
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