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Backside Contacting for Uniform Luminance in Large-Area OLED

Published online by Cambridge University Press:  15 February 2017

P. Pfeiffer
Affiliation:
GaN Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
X. D. Zhang
Affiliation:
GaN Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
D. Stümmler
Affiliation:
GaN Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
S. Sanders
Affiliation:
GaN Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
M. Weingarten
Affiliation:
GaN Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
M. Heuken
Affiliation:
GaN Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany AIXTRON SE, Dornkaulstr. 2, 52134 Herzogenrath, Germany
A. Vescan
Affiliation:
GaN Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
H. Kalisch
Affiliation:
GaN Device Technology, RWTH Aachen University, Sommerfeldstr. 24, 52074 Aachen, Germany
Corresponding
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Abstract

We have investigated organic light emitting diode (OLED) backside contacting for the enhancement of luminance uniformity as a superior alternative to gridlines. In this approach, the low-conductivity OLED anode is supported by a high-conductivity auxiliary electrode and vertically contacted through via holes. Electrical simulations of large-area OLEDs have predicted that this method allows comparable luminance uniformity while sacrificing significantly less active area compared to the common gridline approach.

The method for fabricating backside contacts is comprised of five steps: (1) Thin-film encapsulation of the OLED, (2) Patterning of the OLED surface with lithography (resist mask defining via hole positions), (3) Via hole formation to the bottom anode by a plasma etching process, (4) Organic residues removal and sidewall insulation. (5) Contacting of the anode with a high-conductivity auxiliary electrode.

Backside-contacted OLEDs processed by organic vapor phase deposition show high luminance uniformity. Scanning electron microscopy pictures and electrical breakthrough measurements confirm efficient sidewall insulation.

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Articles
Copyright
Copyright © Materials Research Society 2017 

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References

Slawinski, M., Weingarten, M., Heuken, M., Vescan, A. and Kalisch, H., Organic Electronics 14 (2013).CrossRef
Lifka, H., Van De Weijer, P., Van Mol, A.M.B., U. S. Patent No. US 2012/0074454 A1 (29 March 2012)
Liew, Y-F., Aziz, H., Hu, N-X., Chan, H.S-O., Xu, G., Popovic, Z., Applied Physics Letters 77, 2650 (2000).CrossRef
Han, E-M., Do, L-M., Yamamoto, N., Fujihira, M., Thin Solid Films 273, 202208 (1996)CrossRef
Seifert, R., Scholz, S., Lüssem, B., Leo, K., Applied Physics Letters 97, 013308 (2010).CrossRef
Wu, C.C., Wu, C.I., Sturm, J.C., Kahn, A., Applied Physics Letters 70, 1348 (1997).CrossRef

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