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

Tobias Schwab; Cornelius Fuchs; Reinhard Scholz; XuanHua Li; Fengxian Xie; Wallace Choy; Karl Leo; Malte C. Gather

doi:10.1117/12.2023222

27 September 2013 Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates

Tobias Schwab, Cornelius Fuchs, Reinhard Scholz, XuanHua Li, Fengxian Xie, Wallace Choy, Karl Leo, Malte C. Gather

Author Affiliations +

Proceedings Volume 8829, Organic Light Emitting Materials and Devices XVII; 88291I (2013) https://doi.org/10.1117/12.2023222
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States

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%.

Citation Download Citation

Tobias Schwab, Cornelius Fuchs, Reinhard Scholz, XuanHua Li, Fengxian Xie, Wallace Choy, Karl Leo, and Malte C. Gather "Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates", Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 88291I (27 September 2013); https://doi.org/10.1117/12.2023222

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