Abstract
The use of Tb3+ co-doping for the enhancement of Er3+: 4I11/2 → 4I13/2 mid-infrared emissions can conquer the self-termination bottleneck and provide possible applications in medical surgery, dentistry, remote atmospheric sensing, light detection, and the optical parametric oscillator. The effect of Tb3+ co-doping on the fluorescence emission properties and mutual energy transfer mechanisms were investigated. It was found that Tb3+ greatly increased Er3+ 2.7μm emission by depopulating the Er3+: 4I13/2 level while having little influence on the Er3+: 4I11/2 level, leading to a greater population inversion. The energy transfer efficiency from Er3+: 4I13/2 to Tb3+: 7F0 is as high as 90.27%, and the Er3+: 4I11/2 → 4I13/2 fluorescence lifetime ratio (τ(4I11/2)/ τ(4I13/2)) of the Er3+/Tb3+: PbF2 crystal was calculated to be 422.79%, indicating that Tb3+ ion is an excellent deactivator with which the self-termination bottleneck effect was effectively suppressed. All of these factors imply that Er3+/Tb3+: PbF2 crystal may be a promising material for 2.7μm laser applications.
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