Long-lasting afterglow in Tb3+-doped SiO2–Ga2O3–CaO–Na2O glasses and its sensitization by Yb3+

Abstract Long-lasting afterglow due to Tb 3+ ions has been observed in a Tb 3+ -doped SiO 2 –Ga 2 O 3 –CaO–Na 2 O glass, where a 4s empty orbital of Ga 3+ probably works as an electron-trapping center. The sensitization effect of Yb 3+ on the afterglow has been noticed.