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High-Resolution Patterns of Quantum Dots Formed by Electrohydrodynamic Jet Printing for Light-Emitting Diodes
journal contribution
posted on 2015-12-17, 07:17 authored by Bong Hoon Kim, M. Serdar Onses, Jong Bin Lim, Sooji Nam, Nuri Oh, Hojun Kim, Ki Jun Yu, Jung Woo Lee, Jae-Hwan Kim, Seung-Kyun Kang, Chi Hwan Lee, Jungyup Lee, Jae Ho Shin, Nam Heon Kim, Cecilia Leal, Moonsub Shim, John A. RogersHere
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.