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

Tobias Hübner; Christoph J. Brabec; Britta Göötz; Norwin von Malm

doi:10.1117/12.2552910

1 April 2020 Inkjet printing of multiple layers for large-scale, cadmium-free quantum dot light-emitting diodes

Tobias Hübner, Christoph J. Brabec, Britta Göötz, Norwin von Malm

Proceedings Volume 11365, Organic Electronics and Photonics: Fundamentals and Devices II; 1136505 (2020) https://doi.org/10.1117/12.2552910
Event: SPIE Photonics Europe, 2020, Online Only

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.

Conference Presentation

Citation Download Citation

Tobias Hübner, Christoph J. Brabec, Britta Göötz, and Norwin von Malm "Inkjet printing of multiple layers for large-scale, cadmium-free quantum dot light-emitting diodes", Proc. SPIE 11365, Organic Electronics and Photonics: Fundamentals and Devices II, 1136505 (1 April 2020); https://doi.org/10.1117/12.2552910

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available