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• W2064152093 abstract "The dynamics of the host-sensitized excitation of the high-lying $^{6}G$ state of ${mathrm{Gd}}^{3+}$ in $mathrm{Sc}mathrm{P}{mathrm{O}}_{4}$ is studied as a function of temperature. Excitation of the ${mathrm{Gd}}^{3+}$ $^{6}G$ state has been shown to lead to quantum cutting by photon cascade emission in $mathrm{Sc}mathrm{P}{mathrm{O}}_{4}$. It is demonstrated that the energy transfer from the self-trapped exciton to ${mathrm{Gd}}^{3+}$ is thermally activated probably due to exciton mobility. Whereas at low temperatures, energy transfer from the self-trapped exciton (STE) is dominated by transfer to ``killer centers,'' at room temperature the transfer to ${mathrm{Gd}}^{3+}$ is $g{10}^{10}phantom{rule{0.3em}{0ex}}{mathrm{s}}^{ensuremath{-}1}$ in samples containing 1% ${mathrm{Gd}}^{3+}$ and effectively dominates the energy transfer. The experimental results are well described with a model that assumes two STE states split by $280phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$, a lower triplet and an upper singlet, whose radiative rates differ by about 2 orders of magnitude. The comparison with the model yields a thermal activation energy of $980phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}1}$. Sensitization using the host excitations therefore seems like a promising route to promote quantum cutting with ${mathrm{Gd}}^{3+}$ but hosts with STE emission at or below $200phantom{rule{0.3em}{0ex}}mathrm{nm}$ are necessary for improved quantum yields." @default.
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• W2064152093 date "2008-02-27" @default.
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• W2064152093 title "Energy transfer to<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mi mathvariant=normal>Gd</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>from the self-trapped exciton in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Sc</mml:mi><mml:mi mathvariant=normal>P</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:…" @default.
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• W2064152093 doi "https://doi.org/10.1103/physrevb.77.075129" @default.
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