Inkjet printing of multiple layers for large-scale, cadmium-free quantum dot light-emitting diodes

Hübner T, Brabec C, Göötz B, Von Malm N (2020)

Publication Type: Conference contribution

Publication year: 2020

Journal

Proceedings of SPIE Society of Photo-optical Instrumentation Engineers (SPIE)

Publisher: SPIE

Book Volume: 11365

Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering

Event location: ONLINE

ISBN: 9781510635029

DOI: 10.1117/12.2552910

Abstract

Quantum Dot Light Emitting Diodes (QDLEDs) are a promising alternative to the already established organic LEDs (OLEDs) in applications like automotive rear-lights. QDLEDs can exhibit higher luminance characteristics and superior operational stability. In order to be able to transfer the QDLEDs from their research state into market products, the oftenused Cadmium-containing QDs must be replaced by less toxic alternatives. Furthermore, the processing costs for the QDLEDs have to be minimized. We overcome both challenges by utilizing Indium Phosphide based QDs in the devices and applying inkjet-printing as a low-material consumption deposition technique. Inkjet-printing three layers of the stack design on top of each other proofs to be challenging concerning the layers homogeneity both macroscopically as well as microscopically. We present viable approaches for the ink formulation process, substrate-pretreatment steps and printing strategies to overcome wetting, dewetting and coffee-staining issues. The printed layers are investigated via topological and fluorescent tools and the successfully fabricated devices are examined via electrooptical measurements.

Authors with CRIS profile

Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET)

Involved external institutions

Osram Opto Semiconductors GmbH DE Germany (DE)

How to cite

APA:

Hübner, T., Brabec, C., Göötz, B., & Von Malm, N. (2020). Inkjet printing of multiple layers for large-scale, cadmium-free quantum dot light-emitting diodes. In Sebastian Reineke, Koen Vandewal, Wouter Maes (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. ONLINE: SPIE.

MLA:

Hübner, Tobias, et al. "Inkjet printing of multiple layers for large-scale, cadmium-free quantum dot light-emitting diodes." Proceedings of the Organic Electronics and Photonics: Fundamentals and Devices II 2020, ONLINE Ed. Sebastian Reineke, Koen Vandewal, Wouter Maes, SPIE, 2020.

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