Upconversion luminescence and mechanisms in Yb~(3+) - sensitized Tm~(3+)-doped oxyhalide tellurite glasses

摘要

Effect of Yb_2O_3 content on Upconversion luminescence and mechanisms in Yb~(3+) -sensitized Tm~(3+) -doped oxyhalide tellurite glasses were investigated under 980 nm excitation. Intense blue and relatively weak red Upconversion emission centered at 476 and 649 nm corresponding to the transitions ~1G_4→~3H_6 and ~1G_4→~3H_4 of Tm~(3+), respectively, are simultaneously observed at room temperature. The results show that Upconversion blue and red emission intensities of Tm~(3+) first increase, reach its maximum at Yb_2O_3% = 3 mol%, and then decrease with increasing Yb_2O_3 content. The effect of Yb_2O_3 content on Upconversion intensity is discussed, and possible effect mechanisms are evaluated. The investigated results were conducing to increase Upconversion luminescence efficiency of Tm~(3+).