Ultrafast high-energy luminescence in a high-electron-affinity conjugated polymer

Autor:	Ifor D. W. Samuel, Richard T. Phillips, G. R. Hayes
Rok vydání:	1996
Předmět:	chemistry.chemical_classification chemistry.chemical_compound Materials science chemistry Exciton Electron affinity Polymer Conjugated system Luminescence Ultrashort pulse Molecular physics Oligomer Excitation
Zdroj:	Physical Review B. 54:R8301-R8304
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.54.r8301
Popis:	Results are presented of time-resolved-photoluminescence studies of both films and solutions of a cyano-substituted derivative of poly ($p$-phenylenevinylene) with high electron affinity. For the polymer film a luminescence transient is observed at high energy (2.35 eV) which has a lifetime of 6\ifmmode\pm\else\textpm\fi{}1 ps and is not seen in continuous-wave (cw) measurements. A long-lived (g2 ns) low-energy transition which corresponds to the peak seen in cw measurements is also seen. These results differ greatly from those obtained from a solution of the polymer where only a single luminescence peak is observed. It is shown that the high-energy transition can be explained either by the radiative decay of an interchain excitation or, after comparison with results obtained on a model oligomer of the polymer, by the radiative decay of an intrachain exciton on short-conjugated chain segments. The low-energy transition is attributed to the decay of an interchain excitation.
Databáze:	OpenAIRE
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