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A systematic spectroscopic study of the 4f7 energy levels of Gd3+ in LiYF4 in the vacuum-ultraviolet spectral region (50000–70000cm−1) is reported. Using energy-level calculations, all observed spectral lines could be assigned to free-ion term symbols (including term symbols with unusually high L and J,e.g., a 2Q23/2 level around 67000cm−1). From the 6GJ levels around 50000cm−1 quantum cutting (or two-photon luminescence, photon-cascade emission) is observed: the emission of a red photon due to the 6GJ→6PJ transition is followed by the emission of an ultraviolet photon due to the 6PJ→8S7/2transition

physical review. b, condensed matter

Vacuum-ultraviolet spectroscopy and quantum cutting for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LiYF</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow…

Vacuum-ultraviolet spectroscopy and quantum cutting forGd3+inLiYF4