Abstract
Abstract The up-conversion luminescence and near infrared luminescence of the Er3+ in transparent oxyfluoride glass-ceramics have been investigated. The formation of PbF2 nano-crystals in the glass was confirmed by XRD. From optical absorption spectra, the oscillator strengths for several transitions of the Er3+ in the glass and glass-ceramic have been obtained and then the Judd–Ofelt parameters were calculated by a least squares fitting. The split near infrared emission peaks of the Er3+ ions in the glass-ceramics can be observed because the Er3+ ions have entered into crystalline environment of the β-PbF2 nano-crystals. The up-conversion luminescence intensity of the Er3+ in the glass-ceramics can be observed to be much stronger than that in the glasses. The dependence of the up-conversion luminescence intensity on the current of the LD laser used as excited source indicated that the transition mechanism of the up-conversion luminescence can be ascribed to two-photon absorption process.
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