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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Butt, H.
Engineering and Physical Sciences Research Council
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2023Nanocomposite Hydrogel-Based Optical Fiber Probe for Continuous Glucose Sensing
- 2022Syntheses of gold and silver nanocomposite contact lenses via chemical volumetric modulation of hydrogelscitations
- 2021Gold nanocomposite contact Lenses for color blindness managementcitations
- 2019Hydrogel optical fibers for continuous glucose monitoringcitations
- 2018Highly Efficient Energy Transfer in Light Emissive Poly(9,9-dioctylfluorene) and Poly(p-phenylenevinylene) Blend Systemcitations
- 2018Laser inscription of pseudorandom structures for microphotonic diffuser applicationscitations
- 2018Flexible corner cube retroreflector array for temperature and strain sensingcitations
- 2018Energy Landscape of Vertically Anisotropic Polymer Blend Films toward Highly Efficient Polymer Light-Emitting Diodes (PLEDs)citations
- 2017Phase-conjugated directional diffraction from a retroreflector array hologramcitations
- 2017Electrically Tunable Scattering from Devitrite–Liquid Crystal Hybrid Devices
- 2016Low thresholds for a nonconventional polymer blend - Amplified spontaneous emission and lasing in F8<inf>1-x</inf>:SY<inf>x</inf> systemcitations
- 2016Charge trap assisted high efficiency in new polymer-blend based light emitting diodescitations
- 2015Highly efficient PLEDs based on poly(9,9-dioctylfluorene) and Super Yellow blend with Cs<inf>2</inf>CO<inf>3</inf> modified cathodecitations
- 2013A nano-patterned photonic crystal laser with a dye-doped liquid crystalcitations
Places of action
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article
Energy Landscape of Vertically Anisotropic Polymer Blend Films toward Highly Efficient Polymer Light-Emitting Diodes (PLEDs)
Abstract
<p>A blend of two hole-dominant polymers is created and used as the light emissive layer in light-emitting diodes to achieve high luminous efficiency up to 22 cd A<sup>−1</sup>. The polymer blend F8<sub>1−</sub><sub>x</sub>SY<sub>x</sub> is based on poly(9,9-dioctylfluorene) (F8) and poly(para-phenylene vinylene) derivative superyellow (SY). The blend system exhibits a preferential vertical concentration distribution. The resulting energy landscape modifies the overall charge transport behavior of the blend emissive layer. The large difference between the highest unoccupied molecular orbital levels of F8 (5.8 eV) and SY (5.3 eV) introduces hole traps at SY sites within the F8 polymer matrix. This slows down the hole mobility and facilitates a balance between the transport behavior of both the charge carriers. The balance due to such energy landscape facilitates efficient formation of excitons within the emission zone well away from the cathode and minimizes the surface quenching effects. By bringing the light-emission zone in the middle of the F8<sub>1−</sub><sub>x</sub>SY<sub>x</sub> film, the bulk of the film is exploited for the light emission. Due to the charge trapping nature of SY molecules in F8 matrix and pushing the emission zone in the center, the radiative recombination rate also increases, resulting in excellent device performance.</p>