Intracenter Radiative Transitions in Iron Impurity Centers in Zinc Selenide

The luminescence spectrum of ZnSe samples doped with the Fe impurity by high-temperature thermal diffusion in a Zn or Ar atmosphere is studied in the range 0.6-1.8 mu m. In the luminescence spectra, 980- and 1400-nm lines defined by intracenter radiative transitions in Fe2+ centers are observed. According to the data of spectroscopic scanning, the intensities of both of the lines correlate over the entire sample surface, suggesting that both types of radiative transitions are associated with the same type of centers. Radiative transitions are identified using the Tanabe-Sugano diagram with the parameters adapted to ZnSe:Fe2+ centers (the d (6) electron configuration). The results show that the 980- and 1400-nm lines are defined by the T-3(1)(H-3)-E-5(D-5) and T-3(1)(H-3)-T-5(2)(D-5) electronic transitions, respectively.