Monoclinic CdWO4 is a member of the tungstate family with great potential in diverse applications. However, CdWO4 exhibits a diamagnetic property with a wideband gap of 3.7 eV, limiting its widespread applications. This study reports significant modulation of magnetic and optical properties of hydrothermally grown single-crystalline CdWO4 nanorods with controllable substitution of Cu2+ ions at the Cd2+ site. The chemical environment of Cu and the magnetic and luminescence of nanorods were thoroughly investigated using synchrotron-based powder X-ray diffraction, temperature-dependent photoluminescence, X-ray absorption, element selective X-ray excited optical luminescence spectroscopies, a magnetometer, and micro-Raman spectroscopy. The main feature of this study is an astonishing redshift of ∼0.8 eV in the bandgap energy accompanied by a relative ∼46% drop in the internal quantum efficiency and a progressive transition from diamagnetic to an enhanced magnetization concerning the Cu content. The experimental findings show that significant modulation in optical and magnetic properties is correlated with Cu-doping-induced intermediate energy states and [CuO6] ferromagnetic clusters. The outcome of this study provides important insight into designing doped nanomaterials for photocatalytic applications.

Near-infrared (NIR)-emitting persistent luminescence (PersL) nanoparticles have attracted great attention as a novel optical probe for bioimaging and biosensing applications. These nanoparticles emit long-lasting luminescence after the removal of the...

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The cadmium tungstate rods have been given much attention due to their potential for usage in numerous luminescent applications. We have prepared single crystalline Sn-doped Cd1−xSnxWO4 (where x = 0, 1, 3, and 5%) nanorods (NRDs) and characterized them using refined X-ray diffraction and TEM analysis, revealing a monoclinic phase and a crystallite size that decreased from 62 to 38 nm as Sn concentration increased. Precise Sn doping modulation in CdWO4 NRDs causes surface recombination of electrons and holes, which causes the PL intensity to decrease as the Sn content rises. The chromaticity diagram shows that an increase in the Sn content caused a change in the emission color from sky blue to light green, which was attributed to the increased defect density. The photoluminescence time decay curve of all samples fit well with double-order exponential decay, and the average decay lifetime was found to be 1.11, 0.93, and 1.16 ns for Cd1−xSnxWO4, x = 0, 1, and 5%, respectively. This work provides an understanding of the behavior of Sn-doped CdWO4 NRDs during electron transitions and the physical nature of emission that could be used in bio-imaging, light sources, displays, and other applications.