Effect of the J-J Interaction of Excited States of the Rare-Earth Ion Pr3+ on Magnetically Polarized Luminescence of Praseodymium-Yttrium Aluminum Garnet

摘要

The spectra of luminescence and magnetic circular polarization of luminescence of praseodymium-yttrium aluminum garnet Pr3+ : Y3Al5O12 (PrYAG) are studied in the visible spectral region at temperature T = 300 K. An analysis of spectral dependences of magnetooptical and optical spectra makes it possible to identify optical 4f-4f-transitions between Stark sublevels of multiplets P-3(0), P-3(1), H-3(5), and H-3(6) in PrYAG. It was shown that an important role in the spectrum of the degree of magnetic circular polarization of luminescence of this paramagnetic garnet is played by the effect of quantum-mechanical J-J mixing of states of Stark singlets H-3(5) and H-3(6) of non-Kramer rare-earth ion Pr3+ in the green luminescence band related to forbidden 4f 4f transition P-3(0) H-3(5) in the visible spectral region. To interpret the spectra of magnetic circular polarization of luminescence, the energy of experimentally determined Stark sublevels of multiplets under study, their irreducible representations and wave functions determined by numerical simulation of the energy spectrum of the rare-earth ion Pr3+ in the garnet structure are used.