Abstract
Interactions between identical or nonidentical rare-earth ions that result in the quenching of fluorescence of Eu3+ or Tb3+ have been studied. Comparison of the intensities of emission of Eu3+ as a function of its concentration in various oxides indicates that interactions that result in the quenching of emission from the 5D0 levels of the Eu3+ ions are associated with pairing through intervening oxygen ions. Higher-lying levels appear to be quenched by interactions through anionic groups (e.g., WO42—). The quenching effects that a dissimilar rare-earth ion M has on the emission of Eu3+ or Tb3+ in the sodium rare-earth tungstates correlate with (1) the energy gap between the fluorescing level of the latter and the closest lower-lying level of M, and (2) the total orbital angular momentum of the ground state of M.
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