High-Resolution Patterns of Quantum Dots Formed by Electrohydrodynamic Jet Printing for Light-Emitting Diodes

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• 作者：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. Rogers
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：February 11, 2015
• 年：2015
• 卷：15
• 期：2
• 页码：969-973
• 全文大小：460K
• ISSN：1530-6992

文摘

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.