Luminescence Behavior of Self-Assembled Multilayer Heterostructures of Poly (Phenylenevinylene)

Abstract

Multilayer thin film heterostrutuctures comprised of alternating layers of a poly(phenylene vinylene) (PPV) precursor and various polyanions were fabricated using a new self-assembly technique. Thermal treatment of these films produced multilayers of the fully conjugated form of PPV. Alternating multilayers fabricated with inert polyanions such as sulfonated polystyrene exhibited a very strong photoluminescence whereas alternating multilayers fabricated with electron acceptor polyanions such as sulfonated C60 and poly(thiophene acetic acid) displayed a highly quenched luminescence. This latter behavior suggests that self-assembled multilayers can be used to examine photoinduced charge transfer interactions between PPV and various electron acceptors.

Materials engineering for surface-confined flame retardancy

“…(2) Fabrication of surface-confined devices: the selected deposition sequence eventually defines the final coating architecture, as well as the device properties (some examples refer to the LbL deposition of membrane reactors [18] or light emitting diodes [19,20]). One of the key points of the LbL technique is certainly its simplicity; indeed, in a raw description, the LbL simply consists in an alternate adsorption of chemical species on a selected substrate.…”

Self-Assembled Heterostructures of Electroactive Polymers: New Opportunities for Thin-Film Devices

“…This is particularly true when one considers the use of these materials in thin film heterostructure devices where molecular-level control over layer thickness, interfaces (both internal and electrode interfaces) and thin film architecture is essential to realize the full potential of these systems. Recently, a very simple and yet powerful technique for manipulating charged polymers into multilayer thin films has been described (7,2). This approach, which involves the alternate deposition of oppositely charged polymers from dilute aqueous solutions, makes it possible to process conjugated polymers in a layer-by-layer manner with nanometer level control over the thickness of the individual layers.…”

“…This approach, which involves the alternate deposition of oppositely charged polymers from dilute aqueous solutions, makes it possible to process conjugated polymers in a layer-by-layer manner with nanometer level control over the thickness of the individual layers. To date, our group has demonstrated that this process can be used to manipulate a wide variety of materials into multilayer thin films including, conjugated polyions (3,4), electrically conducting polymers (5,6), light emitting polymers (7)(8)(9)(10), derivatized fullerenes (7,8), precursor polymers (77), and molecular dyes (72). This paper reviews some of our more recent developments in this area.…”

Photoelectrochemical, photophysical and morphological studies of electrostatic layer-by-layer thin films based on poly(p-phenylenevinylene) and single-walled carbon nanotubes

“…Rubner et al 17 prepared LbL thin films based on PPV and fullerene derivatives and reported an efficient polymer luminescence quenching produced by photoinduced electron transfer (a very fast process) between the MEH-PPV and C 60 . In another work, 18 they also fabricated photovoltaic devices with a heterojunction consisting of 20 bilayers of PPV/poly(acrylic acid) and 60 bilayers of C 60 /poly(allyl amine hydrochloride), which exhibited photovoltages of 0.7-0.8 V and efficiency of 10 -2 -10 -3 %.…”