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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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Bown, Mark
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Publications (6/6 displayed)
- 2023Translational MedTech Research - What have we learned?
- 2018Morphology and surface properties of high strength siloxane poly(urethane-urea)s developed for heart valve applicationcitations
- 2018An external quantum efficiency of >20% from solution-processed poly(dendrimer) organic light-emitting diodescitations
- 2015Redox levels of a closo-osmaborane: a density functional theory, electron paramagnetic resonance and electrochemical studycitations
- 2013The impact of tetrahedral capping groups and device processing conditions on the crystal packing, thin film features and OFET hole mobility of 7,14-bis(ethynyl)dibenzo[b,def]chrysenescitations
- 2013Thermally cross-linkable copolymer and its evaluation as a hole transport layer in organic light-emitting diode devicescitations
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article
An external quantum efficiency of >20% from solution-processed poly(dendrimer) organic light-emitting diodes
Abstract
Controlling the orientation of the emissive dipole has led to a renaissance of organic light-emitting diode (OLEDs) research, with external quantumefficiencies (EQEs) of >30% being reported for phosphorescent emitters. These highly efficient OLEDs are generally manufactured using evaporative methods and are comprised of small molecule heteroleptic phosphorescent iridium(III) complexes blended with a host and additional layers to balance charge injection and transport. Large area OLEDs for lighting and display applications would benefit from low cost solution-processing, providing high EQEs could be achieved. Here we show that poly(dendrimer)s consisting of a nonconjugated polymer backbone with iridium(III) complexes forming the cores of first generation dendrimer side chains can be co-deposited with a host by solution processing to give highly efficient devices. Simple bilayer devices comprising the emissive layer and an electron transport layer gave an EQE of >20% at brightnesses of up to ≈300 cd/m2, showing that polymer engineering can enable alignment of the emissive dipole of solution-processed phosphorescent materials.