| People | Locations | Statistics |
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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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Gather, Malte Christian
University of Cologne
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2023Hyperspectral Confocal Imaging for High-Throughput Readout and Analysis of Bio-Integrated Laser Particles
- 2023High-density integration of ultrabright OLEDs on a miniaturized needle-shaped CMOS backplanecitations
- 2021Effective permittivity of co-evaporated metal-organic mixed filmscitations
- 2020Spectroscopic near-infrared photodetectors enabled by strong light-matter coupling in (6,5) single-walled carbon nanotubescitations
- 2020Improving the thermal stability of top-emitting organic light-emitting diodes by modification of the anode interfacecitations
- 2018Investigating the molecular orientation of Ir(ppy)3 and Ir(ppy)2(acac) emitter complexes by X-ray diffractioncitations
- 2018The role of metallic dopants in improving the thermal stability of the electron transport layer in organic light-emitting diodescitations
- 2016Orientation of OLED emitter molecules revealed by XRDcitations
- 2016Elastomer based electrically tunable, optical microcavitiescitations
- 2015Influence of cavity thickness and emitter orientation on the efficiency roll-off of phosphorescent organic light-emitting diodescitations
- 2015Microglia mechanicscitations
- 2014Influence of cavity thickness and emitter orientation on the efficiency roll-off of phosphorescent organic light-emitting diodescitations
- 2009Improving the lifetime of white polymeric organic light-emitting diodescitations
Places of action
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article
Improving the thermal stability of top-emitting organic light-emitting diodes by modification of the anode interface
Abstract
Top‐emitting organic light‐emitting diodes (OLEDs) are of interest for numerous applications, in particular for displays with high fill factors. To maximize efficiency and luminance, molecular p‐doping of the hole transport layer (p‐HTL) and a highly reflective anode contact, for example, made from silver, are used. Atomic layer deposition (ALD) is attractive for thin film encapsulation of OLEDs but generally requires a minimum process temperature of 80 °C. Here it is reported that the interface between the p‐HTL and the silver anode of top‐emitting OLEDs degrades during an 80 °C ALD encapsulation process, causing an over fourfold reduction in OLED current and luminance. To understand the underlying mechanism of device degradation, single charge carrier devices are investigated before and after annealing. A spectroscopic study of p‐HTLs indicates that degradation is due to the interaction between diffusing silver ions and the p‐type molecular dopant. To improve the stability of the interface, either an ultrathin MoO<sub>3</sub> buffer layer or a bilayer HTL is inserted at the anode/organic interface. Both approaches effectively suppress degradation. This work shows a route to successful encapsulation of top‐emitting OLEDs using ALD without sacrificing device performance.