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

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

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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 language	English
Article number	197401
Pages (from-to)	197401-1/4
Number of pages	4
Journal	Physical Review Letters
Volume	88
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.88.197401
Publication status	Published - 2002

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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",

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Conjugation-length dependence of spin-dependent exciton formation rates in pi-conjugated oligomers and polymers

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