Migration-assisted energy transfer at conjugated polymer/metal interfaces

Markov, Denis E.; Blom, Paul W. M.

doi:10.1103/physrevb.72.161401

Cited by 53 publications

(31 citation statements)

References 28 publications

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“…Throughout this work the analysis of both loss mechanism is performed using a numerical model [27] in which drift and diffusion of charge carriers, the effect of spacecharge on the electric field, density dependent mobility [28], Gaussian trap distribution for the electrons [19], quenching at the cathode [29,30], free carrier and trap-assisted recombination is included. Since MEH-PPV has been a workhorse material in the last two decades, the hole and electron transport characteristics and parameters are well known [2,31].…”

Section: Resultsmentioning

confidence: 99%

Non-radiative recombination losses in polymer light-emitting diodes

Kuik

Koster

Dijkstra

et al. 2012

Organic Electronics

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We present a quantitative analysis of the loss of electroluminescence in light-emitting diodes (LEDs) based on poly[2-methoxy-5-(2 0-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) due to the combination of non-radiative trap-assisted recombination and exciton quenching at the metallic cathode. It is demonstrated that for an MEH-PPV LED the biggest efficiency loss, up to 45%, arises from extrinsic non-radiative recombination via electron traps. The loss caused by exciton quenching at the cathode proves only to be significant for devices thinner than 100 nm. Removal of electron traps by purification is expected to enhance the efficiency of polymer LEDs by more than a factor of two.

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Section: Resultsmentioning

confidence: 99%

Non-radiative recombination losses in polymer light-emitting diodes

Kuik

Koster

Dijkstra

et al. 2012

Organic Electronics

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“…This might be the case for PVK and PFO-MEHPV in THF because this is a lower viscosity solvent, and PVK has a longer emission decay. Nevertheless, this interchain donoracceptor process competes with the intrachain energy migration, which is generally faster than the interchain processes (13,15,21,23,35,(38)(39)(40)(41) and strongly dependent on the chain conformations in solution (19,23,24,33,(42)(43)(44)(45)(46)(47)(48)(49). The polymer chain conformation depends on the solvent quality.…”

Section: Energy Transfer In Solutionsmentioning

confidence: 99%

“…Discussions have been appearing in the literature suggesting that the point dipole approximation is not be suitable for conjugated polymers and this should be one of the likely reasons for the overestimation of the R 0 value (10,15,17,21,23,25,(38)(39)(40)(41)47,52). Irrespective of this approximation, there are likely several reasons for the overestimation of R 0 .…”

Section: Energy Transfer In Filmsmentioning

confidence: 99%

Energy Transfer from Poly(Vinyl Carbazole) to a Fluorene‐Vinylene Copolymer in Solution and in the Solid State^†

Bonon¹,

Atvars²

2012

Photochem & Photobiology

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This article reports a comparative study of the energy transfer processes in solution and the solid state from poly(vinyl carbazole; the donor) to dimethylphenyl-terminated poly[(9,9-dioctylfluorenyl-2,7-divinylene-fluorene)-co-alt-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene}] (the acceptor). The results in solutions suggest that a decrease of the donor emission intensity with an increasing acceptor concentration is more closely related to the trivial energy transfer process, indicating that the donor and acceptor chains are not in close contact during the lifetime of the donor excited state. This conclusion was reached using the amplitude-averaged lifetime of the donor, which is practically independent of the acceptor concentration. In the solid state, the polymer blends showed a decrease in the donor emission with an increasing acceptor concentration, and a decrease in the donor lifetime was also observed. Thus, in the solid state, changes in morphology interfere with the nonradiative resonant energy transfer process, but influence on the trivial process cannot be completely neglected. The lifetime does not follow a continuous decrease with the PFO-MEHPV concentration like the emission intensity does. The changes in the lifetime values occur over the same concentration range as do the changes of morphology, as shown by the scanning electron micrographs.

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“…Recently, novel approaches to deal with these problems have been reported [9,10] such as the addition of a hole transport layer (HTL) between the transparent anode and the emitting layer (EML) [9] and/or of an electron transport layer (ETL) sandwiched between the EML and cathode [10]. Recently, novel approaches to deal with these problems have been reported [9,10] such as the addition of a hole transport layer (HTL) between the transparent anode and the emitting layer (EML) [9] and/or of an electron transport layer (ETL) sandwiched between the EML and cathode [10].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Polymeric Composite Films Using Modified TiO2 Nanoparticles for Organic Light Emitting Diodes

Chung¹,

Định²,

Hui³

et al. 2013

Current Nanoscience

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Nanocomposite films for hole transport and emitting layer were prepared from poly(3,4-ethylenedioxythiophene), poly(styrenesulfonate), and poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] -as MEH-PPV -incorporated with anatase (TiO2) nanoparticles dispersed in oleic acid. The precursor for the sol was a solution of tetraiso-propyl orthotitanate [Ti(iso-OC3H7)4]. The research showed that both the electrical and spectral properties of the conjugated polymers were enhanced due to the incorporation of anatase. The best volume ratio between the oleic acid precursor and tetraiso-propyl orthotitanate was found to be of 10. Current-voltage characteristics of organic light emitting diodes made from these nanocomposite films were considerably enhanced in comparison with those made from pure polymers. The luminous efficiency is reported. Mechanical properties of the nanocomposite materials, (in particular for MEH-PPV-TiO2) were found to be dependent on constituent organic and inorganic materials and on the geometric position of constituents. It was concluded that such composite organic light emitting diodes can exhibit larger performance efficiency and longer lifetimes than classical light emitting diodes.

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Migration-assisted energy transfer at conjugated polymer/metal interfaces

Cited by 53 publications

References 28 publications

Non-radiative recombination losses in polymer light-emitting diodes

Non-radiative recombination losses in polymer light-emitting diodes

Energy Transfer from Poly(Vinyl Carbazole) to a Fluorene‐Vinylene Copolymer in Solution and in the Solid State^†

Investigation of Polymeric Composite Films Using Modified TiO2 Nanoparticles for Organic Light Emitting Diodes

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Migration-assisted energy transfer at conjugated polymer/metal interfaces

Cited by 53 publications

References 28 publications

Non-radiative recombination losses in polymer light-emitting diodes

Non-radiative recombination losses in polymer light-emitting diodes

Energy Transfer from Poly(Vinyl Carbazole) to a Fluorene‐Vinylene Copolymer in Solution and in the Solid State†

Investigation of Polymeric Composite Films Using Modified TiO2 Nanoparticles for Organic Light Emitting Diodes

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Energy Transfer from Poly(Vinyl Carbazole) to a Fluorene‐Vinylene Copolymer in Solution and in the Solid State^†