Abstract
We have measured the EPR and induced optical absorption spectra of several fluoroaluminate glasses prepared under different redox conditions and containing NH4HF2, EuF3, or Eu2O3 additions. Analysis of spectra taken after gamma irradiation to various doses and isothermal bleaching kinetics of individual absorption bands indicates that the color centers responsible for induced absorption in the UV spectral region are hole traps related to either oxygen (45000 and 42000 cm−1) or fluorine (37500 cm−1). In the visible range, we have revealed three absorption bands. We assume that the 17400 cm−1 absorption is due to an electron trap involving Y3+. Our data suggest some evidence that paramagnetic hole centers and electronic color centers may be formed in the same events.
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