Intense visible photoluminescence is observed in Yb0.7Tb0.3(PFBS)3 (PBFS = perfluorobutane-sulfonate) coordination polymers upon IR excitation as a result of cooperative up-conversion (UC) processes. These occur when two individually excited Yb3+ ions simultaneously combine their energy into a high-energy excited state of Tb3+.
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Hernández et al. (2010) studied this question.
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