Conjugation-Length Dependence of Spin-Dependent Exciton Formation Rates in Pi-Conjugated Oligomers and Polymers

M Wohlgenannt; X. M Jiang; Z. V Vardeny; R. A. J Janssen

doi:10.1103/PhysRevLett.88.197401

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Conjugation-Length Dependence of Spin-Dependent Exciton Formation Rates in Pi-Conjugated Oligomers and Polymers

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Conjugation-Length Dependence of Spin-Dependent Exciton Formation Rates in Pi-Conjugated Oligomers and Polymers

M Wohlgenannt, X. M Jiang, Z. V Vardeny and R. A. J Janssen

Physical review letters, Vol.88(19), 197401

05/13/2002

DOI: 10.1103/PhysRevLett.88.197401

PMID: 12005663

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Abstract

We have measured the ratio, r=σS/σT of the formation cross section, σ of singlet and triplet excitons from polarons in π-conjugated oligomer and polymer films, using a spectroscopic technique we developed recently. We discovered a universal relation between r and the conjugation length (CL): r−1 depends linearly on CL−1, irrespective of the chain structure. Since r is directly related to the maximum possible electroluminescence quantum efficiency in organic light emitting diodes (OLED), our results indicate that polymers have an advantage over small molecules in OLED applications.

Physics - Soft Condensed Matter

Details

Title: Subtitle: Conjugation-Length Dependence of Spin-Dependent Exciton Formation Rates in Pi-Conjugated Oligomers and Polymers
Creators: M Wohlgenannt - University of Iowa
X. M Jiang
Z. V Vardeny - University of Utah
R. A. J Janssen
Resource Type: Journal article
Publication Details: Physical review letters, Vol.88(19), 197401
DOI: 10.1103/PhysRevLett.88.197401
PMID: 12005663
NLM abbreviation: Phys Rev Lett
ISSN: 0031-9007
eISSN: 1079-7114
Language: English
Date published: 05/13/2002
Academic Unit: Physics and Astronomy
Record Identifier: 9984428803902771

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