Energy transfer mechanism in Er3+ doped fluoride glass sensitize...

Enhanced 2.7 \mu m emission is obtained in Er3+/Tm3+ and Er3+/Ho3+ codoped ZBYA glasses. Absorption and emission spectra are tested to characterize the 2.7 \mu m emission properties of Er3+/Tm3+ and Er3+/Ho3+ doped ZBYA glasses and a reasonable energy transfer mechanism of 2.7 \mu m emission between Er3+ and Tm3+Ho3+) ion is proposed. Codoping of Tm3+ or Ho3+ significantly reduces the lifetime of the Er3+: 4I13/2 level due to the energy transfer of Er3+:4I13/2 →Tm3+:3F4 or Er3+:4I13/2 →Ho3+: 5I7