F-aggregate color centers in sodium-doped KI.
Data are presented for additively colored KI:Na, which identifies the (F(2))(A) absorption and emission bands as peaking at 1.03 and 1.62 microm, respectively. These transitions differ from those previously attributed to this defect. (F(2)(+))(A) centers also were produced and found to absorb near 1.52 microm and emit near 2.36 microm. The (F(2)(+))(A) emission would be of interest for use in achieving tunable color-center laser action.
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Schneider