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Large area inkjet-printed OLED fabrication with solution-processed TADF ink

Author

Listed:
  • Chandra Kant

    (Indian Institute of Technology Kanpur
    National Centre for Flexible Electronics, Indian Institute of Technology Kanpur)

  • Atul Shukla

    (The University of Queensland
    The University of Queensland)

  • Sarah K. M. McGregor

    (The University of Queensland
    The University of Queensland)

  • Shih-Chun Lo

    (The University of Queensland
    The University of Queensland)

  • Ebinazar B. Namdas

    (The University of Queensland
    The University of Queensland)

  • Monica Katiyar

    (Indian Institute of Technology Kanpur
    National Centre for Flexible Electronics, Indian Institute of Technology Kanpur)

Abstract

This work demonstrates successful large area inkjet printing of a thermally activated delayed fluorescence (TADF) material as the emitting layer of organic light-emitting diodes (OLEDs). TADF materials enable efficient light emission without relying on heavy metals such as platinum or iridium. However, low-cost manufacturing of large-scale TADF OLEDs has been restricted due to their incompatibility with solution processing techniques. In this study, we develop ink formulation for a TADF material and show successful ink jet printing of intricate patterns over a large area (6400 mm2) without the use of any lithography. The stable ink is successfully achieved using a non-chlorinated binary solvent mixture for a solution processable TADF material, 3‐(9,9‐dimethylacridin‐10(9H)‐yl)‐9H‐xanthen‐9‐one dispersed in 4,4’-bis-(N-carbazolyl)-1,1’-biphenyl host. Using this ink, large area ink jet printed OLEDs with performance comparable to the control spin coated OLEDs are successfully achieved. In this work, we also show the impact of ink viscosity, density, and surface tension on the droplet formation and film quality as well as its potential for large-area roll-to-roll printing on a flexible substrate. The results represent a major step towards the use of TADF materials for large-area OLEDs without employing any lithography.

Suggested Citation

  • Chandra Kant & Atul Shukla & Sarah K. M. McGregor & Shih-Chun Lo & Ebinazar B. Namdas & Monica Katiyar, 2023. "Large area inkjet-printed OLED fabrication with solution-processed TADF ink," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43014-7
    DOI: 10.1038/s41467-023-43014-7
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    1. Ruben Vicente-Saez & Robin Gustafsson & Clara Martinez-Fuentes, 2021. "Opening up science for a sustainable world: An expansive normative structure of open science in the digital era [The Nature of Academic Entrepreneurship in the UK: Widening the Focus on Entrepreneu," Science and Public Policy, Oxford University Press, vol. 48(6), pages 799-813.
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