Structural and nonlinear optical absorption studies of Mn doped PbWO4 nanoparticles

Manganese (Mn) -doped PbWO4 nanostructures with different concentration of Mn have been synthesized by chemical precipitation method followed by thermal annealing. The influence of Mn on the structural, optical and morphological properties was systematically investigated by various spectral-analytical techniques. X-ray diffraction (XRD) study reveals the successful incorporation of Mn into PbWO4 lattice without any secondary phase formation. From the UV-Vis spectra, it is clear that the dopant has shifted the absorption towards higher wavelength. Photoluminescence measurements showed a broad blue-green emission band with a maximum emission peak centered at 490 nm. The magnetic investigation further evidences the transport of dia to paramagnetism of Mn-doped PbWO4 and weak contribution of ferromagnetism at low magnetic field. It can be due to the effect of Mn clusters in host lattice and led to the changes in the magnetic properties. Typical third order nonlinearity of the proposed Mn-doped PbWO4 nanostructures has been investigated by an open aperture Z-scan technique using 10 ns Nd:YAG laser pulses operating at 532 nm. The nonlinear absorption data suggests that two photon absorption as the dominant nonlinear mechanism. A good nonlinear optical absorption is observed for both pure and doped nanostructures and the nonlinearity increases linearly with increase in Mn concentration.

Automated summary

Manganese-doped PbWO4 nanostructures were synthesized and their structural, optical, morphological, and magnetic properties were investigated. The doping of manganese resulted in a red shift in absorption and a broad blue-green emission band. Magnetic studies showed changes in the magnetic properties due to the manganese doping. Nonlinear optical studies revealed two-photon absorption as the dominant nonlinear mechanism and an increase in nonlinear absorption with increasing manganese concentration.