| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9577457 | Chemical Physics Letters | 2005 | 5 Pages |
Abstract
The upconversion properties of Er3+ doped and Yb3+/Er3+ codoped NaYS2 crystals are presented. Under near-IR excitation around 10Â 000Â cmâ1 intense upconversion emission from the Er3+4F7/2, 4S3/2, 4F9/2 and 4I9/2 excited states is observed at 12Â K. A favorable green 4S3/2 to red 4F9/2 photon ratio of 8 is observed in Er3+ doped NaYS2. Low lying S2â to Yb3+ ligand to metal charge transfer transitions interact with Er3+ emitting states in Yb3+/Er3+ codoped NaYS2 and essentially quench the green emission. In contrast to many oxide and halide materials, Yb3+ is not a suitable sensitizer for Er3+ UC emission in this sulfide host lattice.
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Authors
Pascal Gerner, Hans U. Güdel,