Effect of Yb3+ on red to blue conversion fluorescence of Tm3+ in fluorozirconate glass

摘要: Abstract The mechanisms governing the upconversion fluorescence from 1 G 4 level of Tm 3+ ions have been investigated in fluorozirconate glass doped with only and codoped Yb ions, under 649 ( 3 H → ) 684 nm 6 F excitation wavelengths. emission intensity depends on power quadratically both samples, showing two-photon absorption nature processes. An enhancement was observed sample excitation. single is mainly due to E.S.A. process upon excitations. dominant mechanism found be energy transfer processes between when tuned at nm. upconverted shows a different temperature dependence two excitations sample. However, for same samples. This confirms dominance both, singly doubly