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

1
Department of Molecular Physics, Lodz University of Technology, Lodz 90 924, Poland
2
Department of Physics, Durham University, Durham DH1 3LE, UK
3
Ossila Limited, Sheffield S4 7WB, UK
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(1), 53; https://doi.org/10.3390/mi10010053
Received: 13 December 2018 / Accepted: 9 January 2019 / Published: 14 January 2019
(This article belongs to the Special Issue Printed Flexible and Stretchable Electronics)
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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. View Full-Text
Keywords: slot-die coating; organic light emitting diodes (OLEDs); printed electronics; large area electronics slot-die coating; organic light emitting diodes (OLEDs); printed electronics; large area electronics
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C, A.; Colella, M.; Griffin, J.; Kingsley, J.; Scarratt, N.; Luszczynska, B.; Ulanski, J. Slot-Die Coating of Double Polymer Layers for the Fabrication of Organic Light Emitting Diodes. Micromachines 2019, 10, 53.

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