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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents



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ID: 56193.0, MPI für Polymerforschung / MPI Polymerforschung
Fast field-induced dissociation and recombination of optical excitations in a π-conjugated polymer
Authors:Lupton, J. M.; Im, Chan; Bässler, H.
Language:English
Date of Publication (YYYY-MM-DD):2003-05-21
Title of Journal:Journal of Physics D-Applied Physics
Journal Abbrev.:J. Phys. D-Appl. Phys.
Volume:36
Issue / Number:10
Start Page:1171
End Page:1175
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present time resolved photoluminescence measurements on thin films of a phenyl-substituted poly(phenylene-vinylene) incorporated in a diode structure. Under reverse bias conditions rapid exciton dissociation is observed leading to luminescence quenching by up to 30%. In contrast, under forward bias conditions the initial quenching is substantially reduced due to shielding by space charges. At longer times thermally activated exciton quenching by injected polarons dominates the quenching process. At 3 ns after excitation, the external field is found to enhance the delayed luminescence. We attribute this to increased recombination of spatially correlated charge carrier pairs in the presence of the electric field, which are generated by exciton dissociation by bimolecular annihilation or on defect states.
Comment of the Author/Creator:Date: 2003, MAY 21
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Univ Marburg, Inst Phys Macromol & Nucl Chem, D-35032 Marburg, Germany.; Univ Marburg, Ctr Mat Sci, D-35032 Marburg, Germany.
Identifiers:ISI:000183446100003 [ID No:1]
ISSN:0022-3727 [ID No:2]
LOCALID:P-03-253
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