Abstract

Doping of Ho into AgGaS 2 has been carried out by the thermal diffusion of Ho element into the undoped crystal. Sharp photoluminescence (PL) lines related to the 5S 2→ 5I 8 and 5F 3→ 5I 7 transitions in the Ho 3+ ion are observed in the energy regions 2.23–2.28 and 1.85–1.93 eV, respectively. Temperature dependence and excitation wavelength dependence of the PL indicate the existence of at least four types of Ho-related luminescence centers. Moreover, it is found that PL lines from different Ho-related luminescence centers exhibit different excitation and recombination mechanisms.

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