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Visible quantum cutting (the emission of two photons of visible light per absorbed photon) is reported for LiGdF 4 codoped with Er 3+ and Tb 3+ . In this compound visible quantum cutting is achieved through downconversion, i.e., by making use of energy transfer between different lanthanide ions. Upon VUV excitation in the 4f 10 5d levels of Er 3 ...
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