title: Quantum cutting in CaYAlO4: Pr3+, Yb3+.
abstract: The deposition of a thin layer of a quantum-cutter material on top of silicon-based solar cells seems to be a promising solution to reduce the thermalization losses. This mechanism has been reported in materials codoped with Pr3+-Yb3+, where Pr3+ can sensitize two Yb3+ ions for one absorbed blue photon. In the present Letter, we analyze precisely energy transfers between Pr3+ and Yb3+ in CaYAlO4, and we measure a quantum-cutting rate of 145%. We show that a very efficient back transfer from Yb3+ toward the (1)G4 level of Pr3+ ion leads to a strong reduction of the quantum yield.
authors: CNRS UMR 5620, Laboratoire de Physico-Chimie des Matériaux Luminescents, Université de Lyon, F.69622 Villeurbanne, France. antoine.guille@univ‐lyon1.fr
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authors: Guille
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authors: Pereira
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authors: Martinet
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