Abstract
We characterized the photoinduced gap states from photoinduced absorption (PA) spectroscopy in the halogen(X)-bridged metal(M) complexes having degenerate CDW state, [Pt(en)2][Pt(en)2X2](Cl04)4 (X=Br, I) and those having non-degenerate CDW state, [Pd(en)2][Pt(en)2X2](C104)4 (X=Br, I). In the former complexes, either spin-solitons or charged-solitons were observed depending on the gap energies. In the latter complexes, photogenerations of solitons are suppressed. We have also investigated the excitation profiles of the luminescence from the self-trapped exciton, which are compared with those of the PA signals in the two types of complexes. The results demonstrate that the luminescence process strongly competes with the dissociation to spin-soliton pairs followed by nonradiative recombinations.
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