Abstracts 2005

Abstract of Publication No. 501

Sara García-Revilla, Pascal Gerner, Oliver S. Wenger, Hans U. Güdel and Rafael Valiente
Visible Ni2+ upconversion luminescence in Ni2+, Yb3+ co-doped CsCdBr3
Chem. Phys. Lett. 401, 492-496 (2005)      Full Text (PDF)      DOI-Link     

Abstract: Excitation around 10200 and 10600 cm–1 into the absorption peaks of Yb3+ leads to visible Ni2+ 1T2g 3A2g upconversion luminescence in the doubly doped CsCdBr3: Ni2+, Yb3+ at cryogenic temperatures. The excitation spectrum indicates that an Yb3+ absorption step is involved in the upconversion process leading to visible Ni2+ luminescence. This process via Yb3+ excitation is more efficient than the upconversion mechanism involving only Ni2+, which is observed in the title compound for excitation energies above 11200 cm–1. Upconversion lifetimes point towards an energy transfer upconversion mechanism for the Ni2+/Yb3+ system in CsCdBr3.

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