Luminescence of
EuNa2Mg2false(VO4)3
is six times as bright as that of
YVO4:normalEu
under 365 nm light excitation at room temperature, but it suffers from thermal quenching at higher temperatures. The quenching is mainly caused by non‐radiative relaxation from the emitting states. Energy diffusion among the lowest excited states,
5D0
, to sinks is a main reason of relatively weak quenching below 500°K. At higher temperatures, drastic quenching due to nonradiative relaxation within each Eu3+ ion is observed. Disordered distribution of Eu3+and Na+ revealed by optical and powder x‐ray diffraction measurements is considered to induce the thermal quenching. Similar strong quenching beginning at around 500°–600°K is observed also for other disordered compounds,
EuK5false(MoO4)4
and
normalEuAfalse(MoO4)2 false(A=normalNa,K,normaland Rbfalse)
.
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