Singlet and triplet exciton formation rates in conjugated polymer light-emitting diodes

Z. Shuai, D. Beljonne, R. J. Silbey, Jean-Luc Bredas

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261 Scopus citations


By applying a molecular orbital perturbation approach, we calculate the formation rates for singlet and triplet molecular excitons associated with intermolecular charge-transfer processes. It is found that the interchain bond-charge correlation has a strong influence on the relative probabilities for generating singlet and triplet excitons. Most importantly, application of our approach to a model system for poly-(paraphenylenevinylene) shows that the ratio between the electroluminescence and photoluminescence quantum yields generally exceeds the 25% spin-degeneracy statistical limit.

Original languageEnglish (US)
Pages (from-to)131-134
Number of pages4
JournalPhysical Review Letters
Issue number1
StatePublished - Jan 1 2000

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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