Title
Exciton quenching close to polymer: Vacuum interface of spin-coated films of poly(p-phenylenevinylene) derivative
Author
Mikhnenko, O.V.
Cordella, F.
Sieval, A.B.
Hummelen, J.C.
Blom, P.W.M.
Loi, M.A.
TNO Industrie en Techniek
Publication year
2009
Abstract
Polymer-fullerene bilayer heterostructures are suited to study excitonic processes in conjugated polymers. Excitons are efficiently quenched at the polymer-fullerene interface, whereas the polymer-vacuum interface is often considered as an exciton-reflecting interface. Here, we report about efficient exciton quenching close to the polymer-vacuum interface of spin-coated MDMO-PPV (poly[2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylenevinylene]) films. The quenching efficiency is estimated to be as high as that of the polymer-fullerene interface. This efficient quenching is consistent with enhanced intermolecular interactions close to the polymer-vacuum interface due to the formation of a "skin layer" during the spin-coating procedure. In the skin layer, the polymer density is higher; that is, the intermolecular distances are shorter than in the rest of the film. The effect of exciton quenching at the polymer-vacuum interface should be taken into account when the thickness of the polymer film is on the order of the exciton diffusion length; in particular, in the determination of the exciton diffusion length. © 2009 American Chemical Society.
Subject
Electronics
Industrial Innovation
Bi-layer
Exciton diffusion length
Exciton quenching
Heterostructures
Intermolecular distance
Intermolecular interactions
MDMO-PPV
Methoxy
Phenylenevinylene
Poly(p-phenylene vinylene) derivatives
Polymer densities
Polymer-fullerene
Quenching efficiency
Skin layer
Spin-coated films
Vacuum interfaces
Conjugated polymers
Excitons
Fullerenes
Organic light emitting diodes (OLED)
Plastic films
Polymer films
Quenching
Spin dynamics
Spontaneous emission
Plastic coatings
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TNO identifier
461657
ISSN
1520-6106
Source
Journal of Physical Chemistry B, 113 (27), 9104-9109
Document type
article