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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
Singlet and triplet exciton formation rates in conjugated polymer light-emitting diodes
1Centre de Recherche en Electronique et Photonique Moleculaires Service de Chimie des Materiaux Nouveaux, Universite de Mons-Hainaut, Place du Parc 20, B-7000 Mons, Belgium.
Abstract:
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.
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