Ossila's PhD Student Achieves High-Efficiency Slot-Die Coated OLEDs

Posted on Tue, Jan 15, 2019 by Jon Griffin

After his completing his secondment at Ossila, our Excilight PhD student Amruth has been working hard to publish a paper on his efforts to slot-die coat organic light-emitting diodes (OLEDs). We are excited to announce that his research, titled 'Slot-Die Coating of Double Polymer Layers for the Fabrication of Organic Light Emitting Diodes'  has been published in Micromachines, 10(1), 53.

Amruth using the Ossila Slot-Die Coater.

In this work, Amruth covers the optimisation process for slot-die coating the solution-processed layers used in OLEDs. The OLEDs are made up of a commonly-used system involving a blend of F8BT and PFO deposited onto a PEDOT:PSS hole-transport layer. Alongside this optimisation process, he compares the properties of these thin films and devices against spin-coated references, showing that films deposited via slot-die coating are comparable to those deposited via spin coating. The Ossila Slot-Die Coater was used in this paper.

The basic OLED architecture was comprised of a hole-transport material (HTM) layer and semiconductor emissive layer sandwiched between the two electrodes. Both of these organic layers were deposited by slot-die coating. The OLED efficiency achieved via the slot-die coating method in this paper was found to be 17 times higher than in a 2017 paper for similar OLEDs that used a slot-die coated F8BT layer.

If you are interested in learning more about the slot-die coating technique, you can read the guides below: