Supramolecular Structure of Poly(2-methoxy-5- (2´-ethylhexyloxy) -1,4-phenylenevinylene) (MEH-PPV) Probed Using Wide-angle X-ray Diffraction and Photoluminescence

Variation of the linking positions of the arylene groups in polyarylene vinylene block copolymers can be used as an effective method to fine tune the polymers' emissive characteristics. Through Wittig reaction mechanism 2,5-dioctyloxy-1,4dicarboxaldehyde and varying positional isomers of naphthalene bis(methyl triphenylphosphonium) dibromide gave alternate-block copolymers of poly(2,5-dioctyloxy phenylene vinylene-co-1,4-naphthalene vinylene) (P1), poly(2,5-dioctyloxy phenylene vinylene-co-1,5-naphthalene vinylene) (P2), and poly(2,5-dioctyloxy phenylene vinylene-co-2,6-naphthalene vinylene) (P3). These polymers were highly soluble in common organic solvents. The chemical and physical characteristics of these polymers were carried out using TGA, FTIR, 1H NMR, optical absorption and emission spectral methods. The thermal stabilities of the first two polymers (P1 and P2) were significantly higher than the third polymer (P3). The glass transition temperatures of these polymers were found to be around 70°C. The first two polymers (P1 and P2) showed absorption maxima around 360 nm, whereas the last case showed it at 406 nm. As thin films, all three polymers exhibited red-shifted absorptions. The photoluminescence (PL) emission maxima of P1, P2 and P3 polymers were 467 nm, 484 nm and 495 nm, in the given order. Polymers P1-P3 also showed red-shifted PL emission for their thin films. The differences in the absorption maxima and PL emission maxima of P1 to P3 are due to the strain force between the vinylene and naphthalene protons. While, P3 polymer exhibited electroluminescence maxima at 540 nm and 555 nm in single layer device with a specific configuration (ITO/PEDOT/P3/Al).

Synthesis of alternate-block copolymers of poly(2,5-dioctyloxy phenylene vinylene)s with varying positional naphthalene moieties

http://journal.ippi.ac.ir/manuscripts/IPJ-2008-02-2772.pdf

The Orientation and Photophysical Properties of Polyfluorene-based Conjugated Polymers in Ultrahigh Molecular Weight Polyethylene Films

In this paper we report on the ways to improve the light emission intensity and photoluminescence (PL) properties of poly(p-phenylene vinylene), PPV, based materials by means of doping, copolymerization and also by the use of a vacuum/inert system . We doped the polymer with iron via utilization of the laser ablation technique . Using this method, different amounts of iron were incorporated to the polymer when the laser source was used for the periods of 60 and 120 s . The improvement of PL intensity was experienced for 60 s of doping compared with undoped polymer. We also experienced improvement in PL properties of PPV based materials when 2-methoxy-5-(2'-ethylhexytoxy)-pphenylenevinylene (MEH), 2,5-bis(chloromethyl)-methoxy-4-(2-cyclo-hexylelhyloxy)benzene (MCHE)-PPV copolymer was used . A 1 :1 ratio of MEH-PPV and MCHE-PPV was found to be the best ratio for an optimum PL intensity for this copolymer . We also pointed out that the use of vacuum and inert environment is crucially important in improvement of the tight emitted from the polymer. In the final step of this investigation a computer algorithm was used to classify the copolymers from doped polymers, which was carried out with very accurate predictions of the different classes of the polymers under study.

An investigation on painting polymer with light emission ability on a substrate and three means to enhance the light emission to fabricate new display devices

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An investigation on painting polymer with light emission ability on a substrate and three means to enhance the light emission to fabricate new display devices