Effect of Sm3+, Bi3+ ion doping on the photoluminescence and dielectric properties of phytosynthesized LaAlO3 nanoparticles

Abstract

The LaAlO3, LaAlO3:Sm3+ (1\xa0mol%) and LaAlO3:Sm3+:Bi3+ (1\xa0mol%) nanoparticles were synthesized by phytocombustion synthesis using novel fuel E. tirucalli plant latex. The structure and morphological studies are carried out using various analytical techniques such as powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and diffuse reflectance spectroscopy. PL emission spectra reveal the luminescence properties of the nanoparticles, effectively excited by near UV wavelength (405\xa0nm). Effect of dopant and co-dopant on dielectric properties of LaAlO3 nanoparticles has been studied at room temperature. Results show that the incorporation of Bi3+ co-dopant leads to decrease in dielectric constant. The parameters like loss tangent, real and imaginary part of relative permittivity of LaAlO3, LaAlO3:Sm3+ and LaAlO3:Sm3+:Bi3+ nanoparticles, decreases with increasing frequencies. The complex impedance spectrum analysis along with grain and grain boundary contributions were explained using Cole–Cole plot.