Abstract
We present the first experimental results of femtosecond time-resolved luminescence measurements of a self-trapped exciton (STE) luminescence band in quasi-one-dimensional halogen-bridged platinum complex [Pt(en) 2][Pt(en) 2Cl 2](ClO 4) 4. The time evolution of luminescence has been investigated at room temperature using up-conversion technique. In high-energy tail of the band (from 1.8 to 2.1 eV), a very fast rise and decay are seen, while a slow rise of about 450 fs is observed around the luminescence peak energy. This rise becomes faster at the low energy side of the band. These behaviors are explained by the cooling of STE's just after the rapid self-trapping of photo-generated charge-transfer excitons.
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