Abstract
Persistent spectral hole burning (HB) and fluorescence-line-narrowing (FLN) were observed in BaFCl 0.5Br 0.5:Sm 2+ at 77 K. By adding Br - to BaFCl, the linewidths of 5D J → 7F J transitions of Sm 2+ were broadened by at least one order of magnitude due to the effect of disorder. As a result, tens of holes can potentially be burned in this material at 77 K. The results of FLN indicate that the random arrangement of Cl - and Br - around Sm 2+ ions does not cause a detectable energy level splitting, but shifts the center of gravity of their energy levels. The unexpected two-line structure in FLN is interpreted as accidental coincidence of excitation energies.
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