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Titolo:
FIELD-INDUCED EXCITON BREAKING IN CONJUGATED POLYMERS
Autore:
ARKHIPOV VI; BASSLER H; DEUSSEN M; GOBEL EO; KERSTING R; KURZ H; LEMMER U; MAHRT RF;
Indirizzi:
UNIV MARBURG,FACHBEREICHE PHYS & PHYS CHEM,HANS MEERWEIN STR D-35032 MARBURG GERMANY UNIV MARBURG,ZENTRUM MAT WISSENSCH D-35032 MARBURG GERMANY RHEIN WESTFAL TH AACHEN,INST HALBLEITERTECH 2 D-52074 AACHEN GERMANY
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 7, volume: 52, anno: 1995,
pagine: 4932 - 4940
SICI:
0163-1829(1995)52:7<4932:FEBICP>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
SITE-SELECTIVE FLUORESCENCE; SINGLE-CRYSTALS; PHOTOCONDUCTIVITY; RELAXATION; POLYACETYLENE; EXCITATION; ANTHRACENE; SPECTRA; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
V.I. Arkhipov et al., "FIELD-INDUCED EXCITON BREAKING IN CONJUGATED POLYMERS", Physical review. B, Condensed matter, 52(7), 1995, pp. 4932-4940

Abstract

We have investigated the held-induced quenching of photoluminescence in a film of poly(p-phenylphenylenevinylene) (PPPV) blended with polycarbonate (PC). Upon applying a dc field less than or equal to 3 X 10(6) V cm(-1) a reduction of the luminescence yield up to 30% is observed. Time-resolved photoluminescence measurements using the fs-upconversion technique show that the quenching effect evolves on a time scale 0.5 to similar to 100 ps after excitation. We explain this ultrafast temporal behavior of the quenching process in terms of a field-assisted dissociation of neutral singlet excitations into geminate electron-holepairs while undergoing a random walk among polymer segments. Our model implies that photocarrier generation is a secondary process resulting from exciton dissociation.

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Documento generato il 01/12/20 alle ore 18:41:42