Spectroscopic studies of Sb3+ color centers in alkali halide single crystals

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Abstract
The emission from KCl: Sb3+ and KI: Sb3+ excited in the A‐absorption band was measured as a function of exciting photon energy and temperature. The A‐band excitation produced two emission bands for KCl: Sb3+ and a single band for KI: Sb3+. The definitive assignment of these bands is presented in terms of the adiabatic potential energy surface (APES), in which the effect of the spin–orbit interaction (SO) on the Jahn–Teller (JT) interaction coupling to the Eg mode is taken into account. The polarization spectrum and the angular dependence of polarization ratio of the A‐band emission were also studied to determine the symmetry axes of the Sb3+ –vacancies complex. The results indicate that the anisotropy is associated with the relaxed excited state (RES) of Sb3+. It is also found that the JT interaction coupling to the T2g mode and the vacancies, situated in the next‐nearest‐neighbor (nnn) and the nearest‐neighbor (nn) positions to the Sb3+ ion, give rise to an additive perturbation.