Abstract
The emission spectra of the divalent rare-earth ions Eu 2+, Sm 2+ and Tm 2+, doped into the new compounds SrZnCl 4 and BaZnCl 4, are reported. Eu 2+ and Tm 2+ show broad 4 f n−1 5 d→4 f n emission. Due to the smaller crystal-field splitting, the emission bands for BaZnCl 4:M 2+ are shifted to higher energies when compared to SrZnCl 4:M 2+. For SrZnCl 4:Sm 2+ at 298 K broad 4 f 55 d→4 f 6 emission is observed, while at 20 K additional lines due to the 5D 0→ 7F J transition appear. BaZnCl 4:Sm 2+ shows only line spectra at low temperature. At 298 K a weak d→ f transition is observed. The results are discussed and compared with the corresponding measurements of SrCl 2 and BaCl 2 doped with the divalent rare-earth ions.
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