On-chain defect emission in conjugated polymers – Comment on ‘Exciton dissociation dynamics in a conjugated polymer containing aggregate states’ [A. Haugeneder, U. Lemmer, U. Scherf, Chem. Phys. Lett. 351 (2002) 354]

Autor:	John M. Lupton
Rok vydání:	2002
Předmět:	chemistry.chemical_classification Aggregate (composite) Photoluminescence Chemistry Exciton General Physics and Astronomy Polymer Conjugated system Wavelength Chain (algebraic topology) Chemical physics Polymer chemistry Physical and Theoretical Chemistry Luminescence
Zdroj:	Chemical Physics Letters. 365:366-368
ISSN:	0009-2614
DOI:	10.1016/s0009-2614(02)01448-3
Popis:	On-chain chemical defects have recently been identified as the source of broad, low-energy emission features in polyfluorenes. By considering the evolution of the time-resolved luminescence spectrum of a dilute solution of a ladder-type poly(p-phenylene) it is shown that on-chain defects also play an important role in the emission from these materials. A broad band centred at 560 nm, which has previously been attributed to aggregate emission, is identified in both solution and film, suggesting an incompatibility with the aggregate picture. This provides an explanation for the recent observation of a decrease of field-induced exciton dissociation with increasing emission wavelength as excitons are spatially more localised on chemical defects than on the polymer backbone.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b4c620a3b0556ed24c18ad27103d4c77 https://doi.org/10.1016/s0009-2614(02)01448-3 Zobrazit plný text záznamu Full Text from ScienceDirect