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Micromachines (Basel). 2019 Jan 14;10(1). pii: E53. doi: 10.3390/mi10010053.

Slot-Die Coating of Double Polymer Layers for the Fabrication of Organic Light Emitting Diodes.

Author information

1
Department of Molecular Physics, Lodz University of Technology, Lodz 90 924, Poland. amruth.c@p.lodz.pl.
2
Department of Physics, Durham University, Durham DH1 3LE, UK. marco.colella@durham.ac.uk.
3
Ossila Limited, Sheffield S4 7WB, UK. j.griffin@ossila.com.
4
Ossila Limited, Sheffield S4 7WB, UK. j.kingsley@ossila.com.
5
Ossila Limited, Sheffield S4 7WB, UK. n.scarratt@ossila.com.
6
Department of Molecular Physics, Lodz University of Technology, Lodz 90 924, Poland. beata.luszczynska@p.lodz.pl.
7
Department of Molecular Physics, Lodz University of Technology, Lodz 90 924, Poland. jacek.ulanski@p.lodz.pl.

Abstract

This study presents the slot-die coating process of two layers of organic materials for the fabrication of organic light emitting diodes (OLEDs). Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), which is commonly used in OLEDs and in organic photovoltaic devices as the hole injection layer (HIL), has been deposited via slot-die coating. Uniform films of PEDOT:PSS were obtained after optimizing the slot-die processing parameters: substrate temperature, coating speed, and ink flow rate. The film quality was examined using optical microscopy, profilometry, and atomic force microscopy. Further, poly(9,9-dioctylfluorene) (F8) and poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT), a well know polymer blend F8:F8BT, which is used as an emissive layer in OLEDs, has been slot-die coated. The optoelectronic properties of the slot-die coated F8:F8BT films were examined by means of photoluminescence (PL) and electroluminescence (EL) studies. The fabricated OLEDs, consisting of slot-die coated PEDOT:PSS and F8:F8BT films, were characterized to record the brightness and current efficiency.

KEYWORDS:

large area electronics; organic light emitting diodes (OLEDs); printed electronics; slot-die coating

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