Abstract
A top-emitting organic light-emitting diode is fabricated by a solution-process exclusively, using a PEDOT:PSS formulation with a low contact angle.
Highlights
The choice of the materials is the first step to address a lowcost R2R fabrication process
The electron injection layer (EIL) and electron transport layer (ETL) were optimized in a previous work. They are made of zinc oxide (ZnO) nanoparticles and polyethylenimine ethoxylated (PEIE).[54]
The inverted Organic light emitting diodes (OLEDs) is fabricated in the following device configuration: substrate/Ag/ZnO/TPBi:PEIE/SuperYellow/HTL/ PEDOT:PSS with different tested HTL materials based on WOx
Summary
We investigate all-solution processed OLEDs based on ink-jet printed silver bottom electrodes and spin-coating of all other layers. A conductive PEDOT:PSS formulation processable on organic layers due to a low contact angle is utilized. The all-solution processed top-emitting OLEDs achieve high luminance (7 000 cd mÀ2) and an efficiency close to that of reference devices with evaporated electrodes: 4.2 cd AÀ1 vs 7.6 cd AÀ1, respectively.
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