Investigation of electrospray-deposited PEDOT:PSS thin film using an electrohydrodynamic jet printer for inverted QDLEDs

In general, Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is spin-coated as a hole transport layer in multi-structured quantum dots light-emitting diodes (QDLEDs). However, it is still a challenge to coat hydrophilic PEDOT:PSS on a hydrophobic layer in inverted QDLEDs. Electroh...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2022-02, Vol.33 (5), p.2490-2498
Main Authors: Nguyen, Tuan Canh, Choi, Woon-Seop
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Electrohydrodynamics
Electrospraying
Hydrophobicity
Inks
Jet printing
Light emitting diodes
Materials Science
Optical and Electronic Materials
Polyvinyl carbazole
Quantum dots
Spin coating
Surface roughness
Thickness
Thin films
Zinc oxide
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Summary:In general, Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is spin-coated as a hole transport layer in multi-structured quantum dots light-emitting diodes (QDLEDs). However, it is still a challenge to coat hydrophilic PEDOT:PSS on a hydrophobic layer in inverted QDLEDs. Electrohydrodynamic (EHD) jet printing was applied to make thin films from PEDOT:PSS solution on hydrophobic PVK film. The electrospray-deposited films showed precisely controllable thickness, scalability, and extremely low surface roughness ( R a of 0.55 nm). An inverted QDLED device (ITO/ZnO/QDs/PVK/electrosprayed PEDOT:PSS/Al) was prepared based on the understanding of electrospray droplets mechanism, the formation of PEDOT:PSS film on a PVK film, and drying dynamics of the inks. The device shows a current density of 3.7576 cd A −1 , maximum luminance of 5692 cd m −2 , and EQE of 2.2245%.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-021-07456-3