Study on Tb3+ containing high silica and low silica calcium aluminate glasses: Impact of optical basicity

Two series of glasses based on high silica (CAS) and low silica calcium aluminates (LSCA) have been investigated for their structural, optical and Tb3+ luminescence properties. The compositional modification reduces host phonon energy in LSCA glasses. Still, LSCA glasses exhibit Tb3+ green luminescence quenching, whereas no quenching observed in CAS glasses. Material property influence on this behaviour has been discussed with an insight into the redox state of active ions.

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► Compositional effects in high and low silica calcium aluminate glasses.
► Effect of glass optical basicity on redox state of dopant metal ion.
► Luminescence quenching of Tb3+ by Tb4+ ions.