Abstract
We present spectroscopic studies on the ∼5 μm mid-infrared emission and energy transfer properties of Tb 3+ doped KPb 2Br 5 and Nd 3+ doped KPb 2Br 5 sensitized by Tm 3+ ions. A series of co-doped Tm, Tb: KPb 2Br 5 and Tm, Nd: KPb 2Br 5 samples were prepared from purified starting materials of PbBr 2, KBr, and rare-earth bromides. Resonant excitation into the 3H 6 → 3F 4 absorption transition of Tm 3+ at ∼1.76 μm resulted in an enhanced 5 μm emission from Tb 3+ and Nd 3+ ions in Tm, Tb: KPb 2Br 5 and Tm, Nd: KPb 2Br 5, respectively. The existence of energy transfer between Tm → Tb and Tm → Nd in KPB was further evidenced by the quenching of the emission decay times of the 3F 4 → 3H 6 transition of Tm 3+ in doubly doped Tm, Tb: KPb 2Br 5 and Tm, Nd: KPb 2Br 5 compared to singly doped Tm: KPb 2Br 5.
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