Optical and magnetic properties of (Er, F) co-doped SnO2 nanocrystals

Authors : Vinod KUMAR, Sitharaman UMA, Rajamani NAGARAJAN

Pages : 450-462

Doi:10.3906/fiz-1405-4

View : 18 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Uniformly insert ignore into journalissuearticles values(Er, F); co-doped SnO2 nanocrystals, obtained by a low-temperature solution-based method, were characterized by a variety of analytical techniques. The structure, morphology, and ratio of the elements were confirmed by PXRD, SEM, and TEM analysis, respectively. From XPS analysis, atomic concentrations of Sn, O, and F were quantified. Interparticle pore size increased significantly insert ignore into journalissuearticles values(with a mean pore diameter of 25.82 nm); in the co-doped sample. Higher in-plane oxygen vacancies and bands due to multiphonon scattering were observed in the Raman spectrum of the sample. The defect traps in the sample were experimentally determined using TL spectroscopy. A broad intense glow curve at 485 K and a weak emission at 600 K in the TL spectrum were quenched on exposure to UV radiation. A large blue shift of the exciton absorption insert ignore into journalissuearticles values(due to the Moss--Burstein effect); and sharp bands due to intraconfigurational f-f transitions were observed for insert ignore into journalissuearticles values(Er, F); co-doped SnO2 with an estimated band gap of 4.18 eV. From the photoluminescence spectral studies, 3 types of emission centers at 471 nm, 546 nm, and 627 nm were detected. Co-doping stabilized ferromagnetism in SnO2 at room temperature.
Keywords : Luminescence, ferromagnetism, defects, Moss Burstein effect, nanocrystalline