Abstract of Publication No. 479
Photon upconversion (UC) processes from the near-infrared (NIR) to the visible
(VIS) are studied in Cs2NaScCl6:Pr3+;V3+ and
K2NaScF6:Er3+;V3+ by high-resolution
optical spectroscopy. The transition metal ion with a broad d–d absorption in
the NIR acts as a sensitizer and the lanthanide ion as an upconverter. UC
processes do occur in both title systems, but with rather low efficiencies.
Specific UC mechanisms can be identified from the spectroscopic results.