Enhanced electroluminescence from semiconducting polymer blends

Yu, Gang; Nishino, Hanako; Heeger, Alan J.; Chen, T.-A.; Rieke, Reuben D.

doi:10.1016/0379-6779(95)03282-7

Cited by 102 publications

(46 citation statements)

References 16 publications

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“…[63] Blending low-bandgap PTs with other electroluminescent polymers was employed to increase the EL efficiency of a PLED, and it was demonstrated that even small additions of PTs can improve the device performance. U ex EL of red-light-emitting ITO/P3HT (9f)/MEH-PPV/Ca diodes (P3HT: poly(3-hexylthiophene); MEH-PPV: poly(2-methoxy-5-(2-ethylhexyloxy)-pphenylene vinylene)) initially increased with P3HT content and went through a maximum at 1 wt.-% P3HT with U EL = 1.7 %, [64] which is 2±3 times higher than in the neat ITO/MEH-PPV/Ca diode and three orders-of-magnitude higher than in the ITO/ P3HT (9f)/Ca diode. Later, List et al reported a similar observation of efficient yellow-light emission from the blend of bluelight-emitting ladder poly(p-phenylene) (LPPP) with small additions (0.5±2 %) of orange-light-emitting 9d.…”

Section: Blends Of Ptsmentioning

confidence: 97%

Light‐Emitting Polythiophenes

et al. 2005

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Polythiophenes are one of the most important classes of conjugated polymers, with a wide range of applications, such as conducting films, electrochromics, and field‐effect transistors, which have been the subject of a number of older and more recent reviews. Much less attention has been paid to the light‐emitting properties of this class of materials, although their unique properties present a number of opportunities unavailable from more popular polymeric light emitters such as polyfluorene or poly(p‐phenylene vinylene). This article reviews achievements to date in applications of thiophene‐based polymers and oligomers as electroluminescent materials. We demonstrate the basic principles of controlling the optical properties of polythiophenes through structural modifications and review the most important light‐emitting materials created from thiophene derivatives. Special attention is paid to consequences of structural variations on the performance of light‐emitting diodes fabricated with these materials.

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Section: Blends Of Ptsmentioning

confidence: 97%

Light‐Emitting Polythiophenes

et al. 2005

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“…[25,26] Charge transport in MEH-PPV:P3HT blends and the interfacial electronic structure and photoexcitation kinetics of the heterolayers were investigated, respectively. [27,28] The combination of MEH-PPV and P3HT was also used for preparing nanofibers by electrospinning.…”

Section: Introductionmentioning

confidence: 99%

Thin Films of Photoactive Polymer Blends

et al. 2009

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The morphology inside photoactive blended films of two conjugated homopolymers poly [(1-methoxy)-4-(2-ethylhexyloxy)-p-phenylene-vinylene] (MEH-PPV) and poly(3-hexylthiophene-2,5-diyl) (P3HT) is investigated. For both homopolymers a linear dependence of the installed film thickness from the concentration of the polymer solution used in spin coating is probed. This dependence allows preparation of an efficient series of blended films with constant thickness and different blending ratios. Information about the lateral structure inside the films is gained from grazing incidence small angle X-ray scattering. At the calculated critical blending ratio the smallest lateral separation between adjacent domains is found representing the highest surface contact between both homopolymers in the films. The presence of wetting layers at both interfaces as detected with X-ray reflectivity and atomic force microscopy is promising for photovoltaic applications. UV/Vis spectroscopy complements the structural investigation.

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“…3,4 Blending of organic materials is an attractive approach to optimize and tune the properties of the materials for device applications. [5][6][7][8][9][10] Additionally, blending can result in new phenomena and properties as a result of intermolecular interactions, selforganization ͑or its frustration͒, and confinement effects. 7,11 In organic photovoltaic devices it is especially critical to use a blend rather than a neat material.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8][9][10] Additionally, blending can result in new phenomena and properties as a result of intermolecular interactions, selforganization ͑or its frustration͒, and confinement effects. 7,11 In organic photovoltaic devices it is especially critical to use a blend rather than a neat material. Due to the low dielectric constant typical for organic materials the probability of forming free charges upon light absorption is very low.…”

Section: Introductionmentioning

confidence: 99%

Charge carrier mobility in disordered organic blends for photovoltaics

Koster

2010

Phys. Rev. B

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Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: www.tue.nl/taverne Take down policyIf you believe that this document breaches copyright please contact us at: openaccess@tue.nl providing details and we will investigate your claim. Charge transport in disordered organic blends is studied theoretically by numerically solving the Pauli master equation. The influence of morphology, disorder, electric field, and charge carrier concentration on blend mobility is assessed. Important differences between neat materials and blends are found. The dependence of mobility on charge carrier concentration is more pronounced in blends and it is influenced by the electric field strength. At low charge carrier densities, blend mobility is found to decrease with increasing field. Additionally, the impact of the volume ratio of the constituent materials and their domain size on the mobility is presented. Especially for strongly disordered materials charge transport is favored by relatively large domains. To compare these theoretical findings with existing experimental mobility data, the current density in a space-charge-limited device is computed. The author finds that, for the parameters and morphologies studied, the apparent mobility in such a device decreases with increasing bias voltage.

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Enhanced electroluminescence from semiconducting polymer blends

Cited by 102 publications

References 16 publications

Light‐Emitting Polythiophenes

Light‐Emitting Polythiophenes

Thin Films of Photoactive Polymer Blends

Charge carrier mobility in disordered organic blends for photovoltaics

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