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Article Dans Une Revue Optics Letters Année : 2012

Quantum cutting in CaYAlO_4: Pr^3+, Yb^3+

Résumé

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 G41 level of Pr3+ ion leads to a strong reduction of the quantum yield.
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Dates et versions

hal-04549539 , version 1 (17-04-2024)

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A. Guille, A. Pereira, C. Martinet, B. Moine. Quantum cutting in CaYAlO_4: Pr^3+, Yb^3+. Optics Letters, 2012, 37 (12), pp.2280. ⟨10.1364/OL.37.002280⟩. ⟨hal-04549539⟩
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