Optical Properties of Dy³⁺ Doped in Boroaluminasilicate Glass

Dy³⁺ doped boroaluminasilicate glasses were synthesized in air atmosphere with conventional high temperature process. Optical absorption, emission and excitation spectra of the glasses were measured. Effect of concentration quenching on the lifetime and fluorescence yield was discussed. The pilot study on the changes in emission spectra of Dy³⁺/Tb³⁺, Dy³⁺/Pr³⁺ co-doped glasses was carried out. 451 nm was found to be the ideal wavelength among five excitation wavelength in the UV-Vis region from excitation spectra. The fluorescence spectrum of the sample had three major emission bands at 482, 575 and 662 nm, respectively. The strongest emission band peak was at 575 nm. With an increase in Dy³⁺ concentration beyond a particular value (1%), the concentration quenching phenomenon occurred. The lifetime of ⁴F_9/2 level reduced from 0.9 ms to 0.5 ms when Dy³⁺ concentration increased from 0.2% to 4%. The energy transfer from Dy³⁺ to Tb³⁺ and from Pr³⁺ to Dy³⁺ were detected in the co-doped glasses.