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Mist fabrication of light emitting diodes with colloidal nanocrystal quantum dots

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9 Author(s)
Zhu, T. ; Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA ; Shanmugasundaram, K. ; Price, S.C. ; Ruzyllo, J.
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In this letter, we report a mist-deposition process for the assembly and patterning of nanocrystal quantum dots (NQDs) during the fabrication of quantum dot light emitting diodes (QD-LEDs), which allows for tight controls over the thickness, surface morphology, composition, and resolution of NQD emissive layers. A defect-free featuring uniform brightness QD-LED containing a mist-deposited emissive CdSe(ZnS) NQD layer was demonstrated. Additionally, the technique of successive mist deposition of multicolor NQDs through a set of registered shallow masks was employed to create a 6×6 matrix of alternating pixels composed of 5 nm diameter CdSe(ZnS) NQDs (green) and 8 nm diameter CdSe(ZnS) NQDs (red) on the same substrate. The results obtained demonstrate the potential of mist-deposition technology in the future development of full-color QD-LED displays.

Published in:
Applied Physics Letters  (Volume:92 ,  Issue: 2 )

Date of Publication: Jan 2008

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