Optical and magneto-optical properties of PbFeI2 nanoparticles

Nanocrystals of Pb1-xFexI2 with x up to 0.05 embedded in transparent polymer matrix have been studied by optical absorption, photoluminescence and electron paramagneric resonance. The composite nanostructures containing the semimagnetic semiconductor nanocrystals of Pb1-xFexI2 have been prepared by cooling to the room temperature of boiling saturated aqueous solution. The absorption spectra of nanoparticles exhibit blue shift due to quantum confinement effect. For colloidal solution of nanocrystals and nanostructures incorporated in polymer matrix based on polyvinylalcohol exciton structures of absorption spectra was observed. In photoluminescence spectra of nanoparticles two main peaks were revealed, which are attributed to the band-edge transmission and defects states. The substitutional incorporation of iron ions at lead sites is reflected in EPR studies. Isolated as well as interacting Fe3+ ions are observed in EPR spectra of Pb1-xFexI2 nanocrystals.

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