Abstract
Nanorods of YP0.8V0.2O4:Sm3+ have been synthesized under hydrothermal conditions. Substitution of vanadium (V5+) sites in YVO4 by phosphorus ions (P5+) has been confirmed by Fourier transform infrared spectroscopy, X-ray diffraction and transmission electron microscopy. Careful selection of Sm3+ concentration in YP0.8V0.2O4 enables to achieve the controlled energy transfer from the VO43− absorption to the excited states of Sm3+ ions. The controlled energy transfer has been confirmed from the steady state luminescence and decay lifetime studies of VO43− emission. With the controlled retention of VO43− emission, tuning of light emission from the singly (Sm3+) doped YP0.8V0.2O4 nanorods is realized. At a particular doping concentration of Sm3+ (1.25 at.%), a nearly white light emission is observed. The quantum yield of this nearly white light emission is found to be ∼28%. Tunability of the light and white light emission are supported by CIE chromaticity. The energy transfer efficiency from the VO43− absorption to the excited states of Sm3+ ion in YP0.8V0.2O4 reaches upto ∼86% with the doping concentration of 2.25 at.%.
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