title: High-resolution patterns of quantum dots formed by electrohydrodynamic jet printing for light-emitting diodes.
abstract: Here we demonstrate materials and operating conditions that allow for high-resolution printing of layers of quantum dots (QDs) with precise control over thickness and submicron lateral resolution and capabilities for use as active layers of QD light-emitting diodes (LEDs). The shapes and thicknesses of the QD patterns exhibit systematic dependence on the dimensions of the printing nozzle and the ink composition in ways that allow nearly arbitrary, systematic control when exploited in a fully automated printing tool. Homogeneous arrays of patterns of QDs serve as the basis for corresponding arrays of QD LEDs that exhibit excellent performance. Sequential printing of different types of QDs in a multilayer stack or in an interdigitated geometry provides strategies for continuous tuning of the effective, overall emission wavelengths of the resulting QD LEDs. This strategy is useful to efficient, additive use of QDs for wide ranging types of electronic and optoelectronic devices.
authors.affiliation: Department of Materials Science and Engineering, Beckman Institute for Advanced Science and Technology, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
authors.forename: Bong Hoon
authors.initials: BH
authors.lastname: Kim
authors.forename: M Serdar
authors.initials: MS
authors.lastname: Onses
authors.forename: Jong Bin
authors.initials: JB
authors.lastname: Lim
authors.forename: Sooji
authors.initials: S
authors.lastname: Nam
authors.forename: Nuri
authors.initials: N
authors.lastname: Oh
authors.forename: Hojun
authors.initials: H
authors.lastname: Kim
authors.forename: Ki Jun
authors.initials: KJ
authors.lastname: Yu
authors.forename: Jung Woo
authors.initials: JW
authors.lastname: Lee
authors.forename: Jae-Hwan
authors.initials: JH
authors.lastname: Kim
authors.forename: Seung-Kyun
authors.initials: SK
authors.lastname: Kang
authors.forename: Chi Hwan
authors.initials: CH
authors.lastname: Lee
authors.forename: Jungyup
authors.initials: J
authors.lastname: Lee
authors.forename: Jae Ho
authors.initials: JH
authors.lastname: Shin
authors.forename: Nam Heon
authors.initials: NH
authors.lastname: Kim
authors.forename: Cecilia
authors.initials: C
authors.lastname: Leal
authors.forename: Moonsub
authors.initials: M
authors.lastname: Shim
authors.forename: John A
authors.initials: JA
authors.lastname: Rogers
keywords: Electrohydrodynamic jet printing; electroluminescence; light-emitting diode; nanopatterning; quantum dots