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

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We have measured the ratio, r=sS/sT of the formation cross section, s of singlet and triplet excitons from polarons in p-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, irresp. of the chain structure. Since r is directly related to the max. possible electroluminescence quantum efficiency in org. light emitting diodes (OLED), our results indicate that polymers have an advantage over small mols. in OLED applications
Original languageEnglish
Article number197401
Pages (from-to)197401-1/4
Number of pages4
JournalPhysical Review Letters
Volume88
Issue number19
DOIs
Publication statusPublished - 2002

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