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Enhanced Light Extraction from OLEDs Fabricated on Patterned Plastic Substrates

机译：从图案化塑料基板上制造的OLED增强光提取

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摘要

A key scientific and technological challenge in organic light-emitting diodesrn(OLEDs) is enhancing the light outcoupling factor ηout, which is typicallyrn<20%. This paper reports experimental and modeling results of a promisingrnapproach to strongly increase ηout by fabricating OLEDs on novel flexiblernnanopatterned substrates that result in a >2× enhancement in green phosphorescentrnOLEDs (PhOLEDs) fabricated on corrugated polycarbonate (PC).rnThe external quantum efficiency (EQE) reaches 50% (meaning ηout ≥50%);rnit increases 2.6x relative to a glass/ITO device and 2× relative to devices onrnglass/poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)rnor flat PC/PEDOT:PSS. A significant enhancement is also observed for bluernPhOLEDs with EQE 1.7× relative to flat PC. The corrugated PC substrates arernfabricated efficiently and cost-effectively by direct room-temperature molding.rnThese substrates successfully reduce photon losses due to trapping/waveguidingrnin the organic+anode layers and possibly substrate, and losses tornplasmons at the metal cathode. Focused ion beam gauged the conformality ofrnthe OLEDs. Dome-shaped convex nanopatterns with height of ∼280–400 nmrnand pitch ∼750–800 nm were found to be optimal. Substrate design and layerrnthickness simulations, reported first for patterned devices, agree with thernexperimental results that present a promising method to mitigate photon lossrnpaths in OLEDs.
机译：有机发光二极管（OLED）的关键科学技术挑战是提高光输出耦合系数ηout，该系数通常为rn <20％。本文报道了一种有前途的方法的实验和建模结果，该方法通过在新颖的柔性纳米点阵基板上制造OLED来大大提高ηout，从而导致在波纹聚碳酸酯（PC）上制造的绿色磷光OLED（PhOLED）的> 2倍增强。外部量子效率（EQE）达到50％（意味着ηout≥50％）;相对于玻璃/ ITO设备，相对于玻璃/聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）设备或平面PC / PEDOT：PSS。与平板PC相比，EQE为1.7倍的bluernPhOLED OLED也得到了显着增强。波纹PC基板可通过直接室温成型来高效，经济地制造。这些基板成功地减少了由于有机+阳极层以及可能的基板中的俘获/波导而造成的光子损失，以及金属阴极上的等离激元损失。聚焦离子束测量了OLED的保形性。发现高度约为280-400 nm，节距约为750-800 nm的圆顶形凸纳米图案是最佳的。首先报道的用于图案化设备的基板设计和层厚度模拟与实验结果一致，该实验结果提出了一种有希望的方法来减轻OLED中的光子损耗路径。

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  • 来源
    《Advanced Optical Materials》 |2018年第4期|1701244.1-1701244.11|共11页
  • 作者

    Chamika Hippola; Rajiv Kaudal; Eeshita Manna; Teng Xiao; Akshit Peer; Rana Biswas; Warren Dennis Slafer; Tom Trovato; Joseph Shinar; Ruth Shinar;

  • 作者单位

    Ames Laboratory US Department of Energy Iowa State University Ames, IA 50011, USA Physics and Astronomy Department Iowa State University Ames, IA 50011, USA;

    Ames Laboratory US Department of Energy Iowa State University Ames, IA 50011, USA;

    Electrical and Computer Engineering Department Iowa State University Ames, IA 50011, USA;

    Ames Laboratory US Department of Energy Iowa State University Ames, IA 50011, USA;

    Ames Laboratory US Department of Energy Iowa State University Ames, IA 50011, USA Electrical and Computer Engineering Department Iowa State University Ames, IA 50011, USA;

    Ames Laboratory US Department of Energy Iowa State University Ames, IA 50011, USA Microelectronics Research Center Iowa State University Ames, IA 50011, USA Electrical and Computer Engineering Department Iowa State University Ames, IA 50011, USA;

    MicroContinuum, Inc Cambridge, MA 02138, USA;

    Trovato Manufacturing, Inc Victor, NY 14564, USA;

    Ames Laboratory US Department of Energy Iowa State University Ames, IA 50011, USA;

    Microelectronics Research Center Iowa State University Ames, IA 50011, USA Electrical and Computer Engineering Department Iowa State University Ames, IA 50011, USA;

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  • 关键词

    organic light-emitting diodes; outcoupling; phosphorescent OLEDs; plastic patterned substrates; solid state lighting;

    机译：有机发光二极管;外耦合磷光OLED塑料图案基板固态照明;

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