Results 231 to 240 of about 118,817 (266)

Studies on the efficient synthesis of poly(phenylenevinylene) (PPV) and poly (dimethoxy phenylenevinylene) (dimethoxy-PPV)

Synthetic Metals, 1991
The syntheses of poly(phenylene vinylene) (PPV) and poly(2,5-dimethoxy-phenylene vinylene) (dimethoxy-PPV) have been investigated. Precursor polymers which were soluble and processible were prepared and converted to the conjugated polymers. It was found that the conditions needed to prepare precursor polymers were sensitive to the substrate and the ...
Burn, P. L., Bradley, D. D. C., Brown, A. R., Friend, R. H., Holmes, A. B.   +4 more
openaire   +3 more sources

Substituted PPV's for blue light

Synthetic Metals, 1999
Conjugated polymers based on poly(1,4-phenylenevinylene) (PPV) have provided one of the foundations for polymer based LED's. One of the important routes to these materials is to polymerise a substituted 1,4-bis(halomethylene)benzene to form a soluble halo precursor polymer which is then thermally treated to give the final conjugated polymer, we have ...
Taylor, R. M., Burn, P. L., Bradley, D. D. C.   +2 more
openaire   +3 more sources

Electronic levels in MEH-PPV

Synthetic Metals, 2000
pn-Junctions of MEH-PPV on top of heavily doped n-type silicon were used in electrical measurements. Through deep-level transient-spectroscopy (DLTS)-like measurements, four traps (two majority and two minority traps) could be identified on top of the shallow acceptor level responsible for conduction. Furthermore, evidence is found for interface states.
Stallinga, Peter, Gomes, Henrique L., Rost, H., Holmes, A. B., Harrison, M. G., Friend, R. H.   +5 more
openaire   +2 more sources

Lasing characteristics of PPV microcavities

Synthetic Metals, 1997
Abstract We report lasing characteristics of poly (p-phenylenevinylene) (PPV) microcavity devices.
N. Tessler, G.J. Denton, R.H. Friend
openaire   +1 more source

MetaVInsulatorPolymer - LEDs Based on PPV

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1996
Abstract We investigated the current-voltage (I-V) and electroluminescence (EL) characteristic of metal/polymer and metal/insulator/polymer (MIP) LEDs based on poly (1,4-phenylene vinylene) (PPV). The I-V- and EL characteristics of the MIP structures display a pronounced dependence of the insulator thickness and we measure an increase of the quantum ...
Martin Meier, Michael Cölle, Siegfried Karg, Elke Buchwald, Jürgen Gmeiner, Walter Riess, Markus Schwoerer   +6 more
openaire   +1 more source

Luminescent properties of coumarin-doped MEH-PPV and novel coumarin-terminated MEH-PPV

Materials Chemistry and Physics, 2005
Abstract A series of novel coumarin-terminated poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene (CT-MEH-PPV) were synthesized successfully via Gilch methodology. Luminescent properties of CT-MEH-PPV were compared with those of blend systems.
Yan Huang, Zhi-yun Lu, Qiang Peng, Qing Jiang, Ru-Gang Xie, Shao-Hu Han, Lei-guang Dong, Jun-Biao Peng, Yong Cao, Ming-Gui Xie   +9 more
openaire   +1 more source

Dynamics of spread of PPV-REC and PPV-D in an experimental plum orchard

2012
The three Plum pox virus (PPV) strains (PPV-M, PPV-D and PPV-Rec) are present in Serbian plum orchards. Although PPV-Rec is widespread in plum, little is known about its epidemic properties and competitiveness, in particular when confronted to PPV-D.
Jevremović, D., Paunovic, S., Labonne, Gerard, Dallot, Sylvie   +3 more
openaire   +1 more source

Photoluminescence from MEH-PPV and DP-PPV in bulk and encapsulated in porous alumina

2009
Two PPV derivatives, MEH-PPV and DP-PPV, are encapsulated in the nanopores of anodized alumina with different pore sizes (50/200 nm) and depth (10/60 urn). Time-integrated and time resolved optical emission properties of these structures have been studied and compared with those of thin films of the polymers.
openaire   +1 more source

PPV and the PSIs/HAC Measures

Medical Care, 2017
Bradford D, Winters, Peter J, Pronovost
openaire   +2 more sources

Preliminary evaluation of the competitiveness of PPV-Rec and PPV-D under field conditions

2012
PPV-D, PPV-M and PPV-Rec are the three main strains of Plum pox virus (PPV), the most detrimental viral pathogen of stone fruits (Prunus sp.). While different experimental results reported that PPV-M is more aggressive than PPV-D, limited information are available about the competitiveness of PPV-Rec relatively to PPV-D or PPV-M.
Zagrai, I., Zagrai, L., Labonne, Gerard, Dallot, Sylvie, Festila, A., Baias, I.   +5 more
openaire   +1 more source