Pressure evolution of luminescence in SrxBa1−x(NbO2)3:Pr3+ (x=1/2 and 1/3)

The contribution presents a spectroscopic investigation of SrxBa1−x(NbO2)3 (SBN), (x=1/2 and 1/3) doped with 1 mol% of Pr3+. Photoluminescence and luminescence excitation spectra were measured. Spectroscopic experiments were performed at room temperature at different hydrostatic pressures up to 260 kbar. The emission spectra depend on the excitation wavelength and applied pressure. It was found that pressure causes quenching of the Pr3+ luminescence. This effect was attributed to the existence of praseodymium trapped exciton (PTE) states. Specifically the pressure induces increasing energies of Pr3+ states with respect to the energies of band edges and energy of PTE.