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Complexes 1a·EuIII and 1b·EuIII, but not 1a·TbIII and 1b·TbIII, display strong ‘off–on’ switching of delayed luminescence with alkali cations; the switching efficiency of 1b·EuIII is stronger with K+ rather than Na+.
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Silva et al. (1997) studied this question.
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