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Quantum cutting by cooperative energy transfer in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Yb</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mo>:</mml:mo><mml:msup><mml:mi mathvariant="normal">Tb</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>
Spectroscopic studies of erbium-doped potassium-lead double chloride crystals KPb2Cl5:Er3+: 1. Optical spectra and relaxation of excited states of the erbium ion in potassium-lead double chloride crystals
Efficient near-infrared down conversion in Zn2SiO4:Tb3+,Yb3+ thin-films
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