Synergic effects of Sn4+ doping on the nonlinear optical limiting properties of SnxCd1-xMoO4 nanostructures for optoelectronic applications

Abstract

There is a rising demand in the development of novel nonlinear optical materials comprised out of transition metal molybdates owing to their fascinating optical and luminescent properties, resulting in wide application in future optoelectronic and optical limiting devices. Herein, we report non linear optical properties of novel tin (Sn4+) doped Cadmium molybdate (CdMoO4) nanostructures synthesized via chemical precipitation technique. The X-ray diffraction (XRD) pattern confirms that pristine as well as tin (Sn4+) doped Cadmium molybdate (CdMoO4) are highly crystalline with a tetragonal structure. Raman spectroscopy further confirms the structure and phase formation of SnxCd1-xMoO4 nanostructures. From the UV–Visible absorption spectra, it is observed that the ground state absorption increases in the UV region after the addition of the Sn4+, and the bandgap is found to be decreased. The morphology and particle size was analysed using Transmission electron microscopy (TEM). The surface binding energy and oxidation state was analysed by X-ray photo electron spectroscopy. The non-linear optical properties was studied by z scan technique using Q switched pulsed Nd YAG laser. Experimental results suggests, that two photon absorption mechanism is responsible for the observed nonlinearity. It is found that two photon absorption (β) is increased from 2.51 to 955.5×10−11 and third order susceptibility (χ(3)) enhances from 10.36 to 1480×10−13esu on Sn doping. The optical limiting threshold of pure and SnxCd1-xMoO4 nanostructures was also studied and found to be in the range of 41.45 to 11.92 J/cm2. These results clearly show that SnxCd1-xMoO4 nanostructures as a potential candidate for photonic, optical limi,ting and optoelectronic devices.