Luminescence of Gd-2(WO4)(3):Ln(3+) at ambient and high hydrostatic pressure

作者：Mahlik S^*; Lazarowska A; Grobelna B; Grinberg M

来源：Journal of Physics: Condensed Matter , 2012, 24(48): 485501.

DOI：10.1088/0953-8984/24/48/485501

This paper presents a spectroscopic characterization of Gd-2(WO4)(3):Ln(3+) (Ln = Eu, Pr, Tb and Dy). The luminescence and luminescence kinetics were measured under pressures up to 250 kbar. It was found that pressure quenches the luminescence of Pr3+ and Tb3+, whereas the emission of Eu3+ and Dy3+ was stable up to 250 kbar. This effect was related to a decrease in the ionization energy of Pr3+ and Tb3+ caused by pressure induced increase in energies of the Ln(2+) and Ln(3+) ions with respect to the band edges.
Analysis of emission and excitation spectra allowed us to estimate the energies of the ground states of Ln(3+) and Ln(2+) with respect to the valence and conduction band edges of the Gd-2(WO4)(3) host. Differences between energies of the ground states of Ln(2+) and Ln(3+) have also been calculated.

• 出版日期2012-12-5