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Titolo:
EXCITATION DYNAMICS IN ALPHA-SEXITHIOPHENE SINGLE-CRYSTALS AND UHV-GROWN FILMS
Autore:
HOPMEIER M; MARKS RN; MICHEL R; MUCCINI M; MURGIA M; ZAMBONI R; TALIANI C; HOROWITZ G; GARNIER F; OESTREICH M; MAHRT RF;
Indirizzi:
UNIV MARBURG,FACHBEREICH PHYS,RENTHOF 5 D-35032 MARBURG GERMANY UNIV MARBURG,ZENTRUM MAT WISSENSCH D-35032 MARBURG GERMANY CNR,IST SPETTROSCOPIA MOL I-40126 BOLOGNA ITALY CNRS,MAT MOL LAB F-94320 THIAIS FRANCE
Titolo Testata:
Journal of luminescence
, volume: 76-7, anno: 1998,
pagine: 416 - 419
SICI:
0022-2313(1998)76-7:<416:EDIASA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
ABSORPTION; SOLITONS; POLYMERS;
Keywords:
OLIGOTHIOPHENE; STRUCTURAL DISORDER; OPTICAL PROPERTIES; TIME-RESOLVED PHOTOLUMINESCENCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
M. Hopmeier et al., "EXCITATION DYNAMICS IN ALPHA-SEXITHIOPHENE SINGLE-CRYSTALS AND UHV-GROWN FILMS", Journal of luminescence, 76-7, 1998, pp. 416-419

Abstract

We have investigated the disorder-determined optical properties of alpha-sexithiophene by comparing measurements of an evaporated film and a single crystal. We observed for the first time sharp lines in absorption and photoluminescence from both samples representing the intrinsic electronic properties of the material. The time-integrated emission spectra of both samples are dominated by radiative trap emission, which is more pronounced in the him due to the higher degree of disorder. Photoluminescence excitation and site-selective photoluminescence measurements show the different origin and character of the traps in the samples. We attribute the single crystal traps to the so-called X-trapswhile the nature of the traps in the film is still undetermined. Time-resolved photoluminescence measurements of the film show a fast transfer process of the sharp bulk emitters to the unstructured trap emission within the first 50 ps after excitation. A comparable process is observable in the single crystal, showing a slower dynamics due to lowertrap density. (C) 1998 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 05:55:06