Delayed luminescence of the ladder-type methyl-poly( para-phenylene)

The delayed luminescence of a film of ladder-type π-conjugated polymer – the methyl-substituted poly( para-phenylene) (MeLPPP) – has been detected and investigated at 6, 77 and 295 K. The delayed emission consists of a delayed fluorescence (DF) in the region of 450–550 nm, which decreases by a facto...

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Bibliographic Details
Published in:Chemical physics 1999-10, Vol.249 (1), p.29-39
Main Authors: Romanovskii, Yu.V, Gerhard, A, Schweitzer, B, Personov, R.I, Bässler, H
Format: Article
Language:English
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Summary:The delayed luminescence of a film of ladder-type π-conjugated polymer – the methyl-substituted poly( para-phenylene) (MeLPPP) – has been detected and investigated at 6, 77 and 295 K. The delayed emission consists of a delayed fluorescence (DF) in the region of 450–550 nm, which decreases by a factor of 10 during 200 ns (at 77 K), and a phosphorescence in the region of 600–750 nm with a much slower decay rate. The latter decreases by a factor of 10 during about 100 μs. The DF spectrum is the superposition of the intrinsic fluorescence emission and an excimer-type emission. The analysis of the experimental data provides evidence for a geminate pair recombination being the origin of both types of DF.
ISSN:0301-0104
DOI:10.1016/S0301-0104(99)00254-2