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Micron‐Scale Patterning of High Quantum Yield Quantum Dot LEDs

Micron‐Scale Patterning of High Quantum Yield Quantum Dot LEDs Micron‐scale resolution patterning of colloidal quantum dots (QDs) is demonstrated by adopting inkjet printing as a technique that is solvent and room temperature compatible, maintains optical and electronic properties of printed QD films, and results in minimal materials waste during the deposition process. With a combination of solvent engineering and substrate patterning single prints of PbS–CdS core–shell QDs (with peak photoluminescence emission at λ = 1270 nm wavelength) are deployed to form QD films of nanoscale‐thickness, with regular micron‐scale patterns. Inkjet printing of infrared QD films is chosen as a case study for manufacture of QD‐light emitting diodes (QD‐LEDs), and demonstrates devices with a record peak external quantum efficiency in excess of 2% that is finally comparable with state‐of‐the‐art spin‐coated prototypes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Materials Technologies Wiley

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Publisher
Wiley
Copyright
© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
eISSN
2365-709X
DOI
10.1002/admt.201800727
Publisher site
See Article on Publisher Site

Abstract

Micron‐scale resolution patterning of colloidal quantum dots (QDs) is demonstrated by adopting inkjet printing as a technique that is solvent and room temperature compatible, maintains optical and electronic properties of printed QD films, and results in minimal materials waste during the deposition process. With a combination of solvent engineering and substrate patterning single prints of PbS–CdS core–shell QDs (with peak photoluminescence emission at λ = 1270 nm wavelength) are deployed to form QD films of nanoscale‐thickness, with regular micron‐scale patterns. Inkjet printing of infrared QD films is chosen as a case study for manufacture of QD‐light emitting diodes (QD‐LEDs), and demonstrates devices with a record peak external quantum efficiency in excess of 2% that is finally comparable with state‐of‐the‐art spin‐coated prototypes.

Journal

Advanced Materials TechnologiesWiley

Published: Jul 1, 2019

Keywords: ; ; ; ;

References