Heterogeneous stacking of nanodot monolayers by dry pick-and-place transfer and its applications in quantum dot light-emitting diodes

Tae-Ho Kim, Dae-Young Chung, JiYeon Ku, Inyong Song, Soohwan Sul, Dae-Hyeong Kim, Kyung-Sang Cho (), Byoung Lyong Choi (), Jong Min Kim, Sungwoo Hwang and Kinam Kim
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Tae-Ho Kim: Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics
Dae-Young Chung: Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics
JiYeon Ku: Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics
Inyong Song: Analytic Science Group, Samsung Advanced Institute of Technology, Samsung Electronics
Soohwan Sul: Analytic Science Group, Samsung Advanced Institute of Technology, Samsung Electronics
Dae-Hyeong Kim: Center for Nanoparticle Research of Institute for Basic Science, School of Chemical and Biological Engineering, Seoul National University
Kyung-Sang Cho: Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics
Byoung Lyong Choi: Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics
Jong Min Kim: Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics
Sungwoo Hwang: Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics
Kinam Kim: Samsung Advanced Institute of Technology, Samsung Electronics

Nature Communications, 2013, vol. 4, issue 1, 1-12

Abstract: Abstract Layered assembly structures composed of nanomaterials, such as nanocrystals, have attracted considerable attention as promising candidates for new functional devices whose optical, electromagnetic and electronic behaviours are determined by the spatial arrangement of component elements. However, difficulties in handling each constituent layer in a material-specific manner limit the 3D integration of disparate nanomaterials into the appropriate heterogeneous electronics. Here we report a pick-and-place transfer method that enables the transfer of large-area nanodot assemblies. This solvent-free transfer utilizes a lifting layer and allows for the reliable transfer of a quantum dot (QD) monolayer, enabling layer-by-layer design. With the controlled multistacking of different bandgap QD layers, we are able to probe the interlayer energy transfer among different QD monolayers. By controlling the emission spectrum through such designed monolayer stacking, we have achieved white emission with stable optoelectronic properties, the closest to pure white among the QD light-emitting diodes reported so far.

Date: 2013
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DOI: 10.1038/ncomms3637

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