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Ultrafast charge photogeneration and exciton regeneration at polymeric semiconductor heterojunctions

Optics InfoBase Conference Papers (2004)

Authors:

AC Morteani, P Sreearunothai, LM Herz, RH Friend, C Silva

Abstract:

We investigate photoexcitation dynamics in blends of electron and hole transporting conjugated polymers. Excitons that dissociate at the heterojunction can be regenerated efficiently via geminate-pair recombination and endothermic energy transfer from intermediate exciplex states.

Morphology-dependent energy transfer within polyfluorene thin films - art. no. 085201

PHYSICAL REVIEW B 69:8 (2004) ARTN 085201

Authors:

ALT Khan, P Sreearunothai, LM Herz, MJ Banach, A K枚hler

Exciton bimolecular annihilation dynamics in supramolecular nanostructures of conjugated oligomers

(2003)

Authors:

Cl茅ment Daniel, Laura M Herz, Carlos Silva, Freek JM Hoeben, Pascal Jonkheijm, Albertus PHJ Schenning, EW Meijer

Exciton dynamics in supramolecular assemblies of p-phenylenevinylene oligomers

SYNTHETIC MET 139:3 (2003) 839-842

Authors:

LM Herz, C Daniel, C Silva, FJM Hoeben, APHJ Schenning, EW Meijer, RH Friend, RT Phillips

Abstract:

We have investigated the dynamics of photoexcitations in chiral assemblies of p-phenylenevinylene oligomers functionalized with hydrogen-bonding motifs. In the regime of low excitation densities, the luminescence transients are influenced by the migration of excitons to defect sites, indicative of fast diffusivity of excitons along the molecular assemblies. In addition, at high excitation densities, bimolecular exciton annihilation is shown to result in the fast depopulation of the stacks' excitonic energy levels. (C) 2003 Elsevier B.V. All rights reserved.

Exciton and polaron dynamics in polymeric semiconductors: The influence of interchain order.

ABSTR PAP AM CHEM S 226 (2003) U300-U300

Authors:

C Silva, LM Herz, C Daniel