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

作者：Kim Bong Hoon; Onses M Serdar; Lim Jong Bin; Nam Sooji; Oh Nuri; Kim Hojun; Yu Ki Jun; Lee Jung Woo; Kim Jae Hwan; Kang Seung Kyun; Lee Chi Hwan; Lee Jungyup; Shin Jae Ho; Kim Nam Heon; Leal Cecilia; Shim Moonsub; Rogers John A^*

来源：Nano Letters, 2015, 15(2): 969-973.

DOI：10.1021/nl503779e

• Electrohydrodynamic jet printing
• nanopatterning
• quantum dots
• light-emitting diode
• electroluminscence

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.

• 出版日期2015-2