title: Colloidal CdSe(1-x)S(x) Nanoplatelets with Narrow and Continuously-Tunable Electroluminescence.
abstract: Colloidal nanoplatelets, quasi-two-dimensional quantum wells, have recently been introduced as colloidal semiconductor materials with the narrowest known photoluminescence line width (∼10 nm). Unfortunately, these materials have not been shown to have continuously tunable emission but rather emit at discrete wavelengths that depend strictly on atomic-layer thickness. Herein, we report a new synthesis approach that overcomes this issue: by alloying CdSe colloidal nanoplatelets with CdS, we finely tune the emission spectrum while still leveraging atomic-scale thickness control. We proceed to demonstrate light-emitting diodes with sub-bandgap turn-on voltages (2.1 V for a device emitting at 2.4 eV) and the narrowest electroluminescence spectrum (FWHM ∼12.5 nm) reported for colloidal semiconductor LEDs.
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Fengjia
authors.initials: F
authors.lastname: Fan
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Pongsakorn
authors.initials: P
authors.lastname: Kanjanaboos
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Mayuran
authors.initials: M
authors.lastname: Saravanapavanantham
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Eric
authors.initials: E
authors.lastname: Beauregard
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Grayson
authors.initials: G
authors.lastname: Ingram
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Emre
authors.initials: E
authors.lastname: Yassitepe
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Michael M
authors.initials: MM
authors.lastname: Adachi
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Oleksandr
authors.initials: O
authors.lastname: Voznyy
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Andrew K
authors.initials: AK
authors.lastname: Johnston
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Grant
authors.initials: G
authors.lastname: Walters
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Gi-Hwan
authors.initials: GH
authors.lastname: Kim
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Zheng-Hong
authors.initials: ZH
authors.lastname: Lu
authors.affiliation: †Department of Electrical and Computer Engineering and ‡Department of Materials Science and Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
authors.forename: Edward H
authors.initials: EH
authors.lastname: Sargent
keywords: CdSe1−xSx; alloying; colloidal nanoplatelets; electroluminescence; solution-processed light-emitting diodes