Abstracts 2001

Abstract of Publication No. 398

Oliver S. Wenger and Hans U. Güdel
Chemical Tuning of the Photon Upconversion Properties in Ti2+-Doped Chloride Host Lattices
Inorg. Chem. 40, 5747-5753 (2001)      Full Text (PDF)      DOI-Link     

Abstract: The photophysical properties of Ti2+-doped NaCl and MgCl2 at 15 K are compared. At this temperature both materials emit luminescence from their respective lowest excited states and from the 3T1g(t2geg) higher excited state. In Ti2+:MgCl2 the ligand field is significantly stronger than in Ti2+:NaCl, leading to 1T2g(t2g2) and 3T2g(t2geg) lowest excited states, respectively, in these materials. The near-infrared to visible upconversion mechanisms of these two materials are identified. The upconversion efficiency calculated for Ti2+:MgCl2 is approximately 2 orders of magnitude higher than for Ti2+:NaCl. This is mainly due to the more efficient energy storage in the intermediate upconversion level in Ti2+:MgCl2, and its higher 3T1g(t2geg) -> 3T1g(t2g2) luminescence quantum yield relative to Ti2+:NaCl.

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