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

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

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摘要

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-μm 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%.

源语言英语
文章编号88291I
期刊Proceedings of SPIE - The International Society for Optical Engineering
8829
DOI
出版状态已出版 - 2013
已对外发布
活动Organic Light Emitting Materials and Devices XVII - San Diego, CA, 美国
期限: 25 8月 201328 8月 2013

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