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Ultrasonic spray coating of polyethylenimine (ethoxylated) as electron injection and transport layer for organic light emitting diodes

Inge Verboven1,2*, Rachith Shanivarasanthe Nithyananda Kumar1,2, Melissa Van Landeghem1,2, Hilde Pellaers1,2, Bart Ruttens1,2, Jan D’Haen1,2, Koen Vandewal1,2, Wim Deferme1,2*

1 Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, B-3590 Diepenbeek, Belgium

2 IMEC vzw – Division IMOMEC, Wetenschapspark 1, B-3590 Diepenbeek, Belgium

* Corresponding authors emails: inge.verboven@uhasselt.be, wim.deferme@uhasselt.be
DOI10.24435/materialscloud:e6-sf [version v1]

Publication date: Jun 21, 2021

How to cite this record

Inge Verboven, Rachith Shanivarasanthe Nithyananda Kumar, Melissa Van Landeghem, Hilde Pellaers, Bart Ruttens, Jan D’Haen, Koen Vandewal, Wim Deferme, Ultrasonic spray coating of polyethylenimine (ethoxylated) as electron injection and transport layer for organic light emitting diodes, Materials Cloud Archive 2021.90 (2021), doi: 10.24435/materialscloud:e6-sf.

Description

The lighting of the future is expected to be light weight, flexible, highly efficient, non-expensive and fabricated in an environmentally friendly way. Organic light emitting diodes meet all these requirements and can be fabricated using inexpensive and roll-to-roll compatible printing techniques. They however often use low work function, highly reactive metals, such as barium and calcium to facilitate electron injection, deposited using expensive and non-continuous vacuum techniques. Efficient and stable alternatives can be found in the aliphatic amines, polyethylenimine and polyethylenimine(ethoxylated), which shift the work function of aluminum favorably for electron injection. This work demonstrates ultrasonic spray coating of polyethylenimine and polyethylenimine(ethoxylated) as electron injection and transport layer for OLEDs, reducing the work function of the aluminum cathode by 0.355 eV allowing a luminous efficacy comparable to that of the OLEDs using calcium/aluminum electrodes. Slightly higher luminous results are noted for the OLEDs with spin coated PEIE, indicating that the surface morphology and thickness of the polyethylenimine(ethoxylated) layer are crucial factors: ultrasonic spray coated polyethylenimine(ethoxylated) layers have an increased overall thickness and surface roughness. This study confirms the versatility of ultrasonic spray coating and the suitability of polyethylenimine(ethoxylated) as excellent electron injection and transport layer for OLEDs and paves the way towards fully spray coated OLEDs. The produced OLEDs were measured using a Keithley 2401 source meter (Keithley Instruments, Cleveland, Ohio, USA) to obtain the current and voltage characteristics and by using an absolute calibrated integrating sphere spectrometer from Avantes (Apeldoorn, The Netherlands) to acquire the luminous flux. The luminous efficacy was then calculated by dividing the luminous flux by the used electrical power. This data is presented here.

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Files

File name Size Description
Data PEIE paper.zip
MD5md5:0a3323506e2c4605473ba6aa61e61f3b
178.8 KiB Data for luminous flux, current and voltage of OLEDs (figure 1, 6, 7 and 8)
README.docx
MD5md5:500022a9b0283afdf143cefb7ce7f2ef
21.8 KiB README file

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
Metadata, except for email addresses, are licensed under the Creative Commons Attribution Share-Alike 4.0 International license.

External references

Journal reference (Paper in which the method is described and where the data is discussed)
I. Verboven, R. Shanivarasanthe Nithyananda Kumar, M. Van Landeghem, H. Pellaers, B. Ruttens, J. D'Haen, K. Vandewal, W. Deferme, submitted (2021)

Keywords

Organic light emitting diodes Electron injection and transport layer Ultrasonic spray coating Polyethylenimine (ethoxylated) Printing technique Experimental

Version history:

2021.90 (version v1) [This version] Jun 21, 2021 DOI10.24435/materialscloud:e6-sf