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Proceedings Paper

Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates
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Paper Abstract

Bragg scattering by one dimensional periodic structures is investigated in order to enhance the outcoupling effciency of optically optimized planar top-emitting OLEDs. Using a soft imprint process, we fabricate extremely homogeneous gratings with sub- m period. These gratings are integrated beneath the bottom contact of topemitting OLEDs, without affecting the electrical device performance. The reflective contacts of the top emission geometry introduce pronounced micro-cavity effects for directly outcoupled and internally trapped light modes. Bragg scattering of the trapped waveguided and surface plasmon modes into the air cone, i.e. the forward direction, leads to interference with the directly outcoupled mode. As a result, constructive and destructive interference of the modes is detected and analyzed. Overall, we find that the introduction of shallow one dimensional sub- m periodic grating structures underneath top-emitting OLEDs leads to an EQE and luminous efficacy enhancement by up to 42%.

Paper Details

Date Published: 27 September 2013
PDF: 9 pages
Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 88291I (27 September 2013); doi: 10.1117/12.2023222
Show Author Affiliations
Tobias Schwab, Technische Univ. Dresden (Germany)
Cornelius Fuchs, Technische Univ. Dresden (Germany)
Reinhard Scholz, Technische Univ. Dresden (Germany)
XuanHua Li, The Univ. of Hong Kong (Hong Kong, China)
Fengxian Xie, The Univ. of Hong Kong (Hong Kong, China)
Wallace Choy, The Univ. of Hong Kong (Hong Kong, China)
Karl Leo, Technische Univ. Dresden (Germany)
Malte C. Gather, Technische Univ. Dresden (Germany)

Published in SPIE Proceedings Vol. 8829:
Organic Light Emitting Materials and Devices XVII
Franky So; Chihaya Adachi, Editor(s)

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