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We observed ultraviolet and visible up-conversion signals with maximum intensity at 383nm, 407nm, 457nm, 474nm, 525nm, 552nm, 652nm, 696nm, 772nm, 801nm, 814nm and 848nm from the 4f states of erbium-doped KYb(WO 4 ) 2 single crystals after pumping at 981nm (10194cm −1 ) at room temperature (RT) and low temperature (10K). These emissions were generated after simultaneous excitation...
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