Time-Resolved Spectroscopy of 4 S 3/2 Energy State in Er3+-Doped Fluoroaluminate Glass in a Wide Temperature Range

The development and characterization of some optical properties of erbium Er3+-doped 98(MgF2-CaF2-SrF2-BaF2-YF3-AlF3)-2(Ba(PO3)(2)) glass are reported. Luminescence peaks with maxima at 522, 545, 665, and 852 nm are observed upon excitation at a wavelength of 487 nm. The nature of the radiation transitions is explained on the basis of the energy diagram of erbium ions. For the most intense transition (4) S (3/2)->(4) I (15/2), the lifetime dependence of the (4) S (3/2) state is determined in the temperature range of 90-503 K. The experimental dependence is analyzed using the Riseberg-Moos multiphonon relaxation model. It is shown that the main reason for the decrease in the lifetime is temperature quenching of luminescence caused by a decrease in the effective energy gap Delta E ((2) H (11/2)-(4) S (3/2)). The temperature range of applicability of the theoretical Reisberg-Moose model for the (4) S (3/2) ->(4) I (15/2) transition is determined.