N. Takada et al., INTENSE MECHANOLUMINESCENCE FROM EUROPIUM TRIS(2-THENOYLTRIFLUOROACETONE) PHENANTHROLINE, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 294, 1997, pp. 369-372
Four new kinds of europium complexes were synthesized and their mechan
oluminescent properties were investigated. Out of the four, only europ
ium tris(2-thenoyltrifluoroacetone) phenanthroline (Eu(TTA)(3)(phen))
exhibited intense mechanoluminescence. Its spectra were measured and f
ound to be essentially the same as that of the photoluminescence, indi
cating an identical emitting species. The excitation mechanisms of mec
hanoluminescence are also discussed.