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Micron‐Scale Patterning of High Quantum Yield Quantum Dot LEDs
Author(s) -
Azzellino Giovanni,
Freyria Francesca S.,
Nasilowski Michel,
Bawendi Moungi G.,
Bulović Vladimir
Publication year - 2019
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201800727
Subject(s) - quantum dot , light emitting diode , materials science , quantum yield , photoluminescence , nanoscopic scale , optoelectronics , substrate (aquarium) , diode , nanotechnology , deposition (geology) , wavelength , fluorescence , optics , physics , oceanography , geology , paleontology , sediment , biology
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.