Enhanced Light Extraction from OLEDs Fabricated on Patterned Plastic Substrates,Advanced Optical Materials

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Enhanced Light Extraction from OLEDs Fabricated on Patterned Plastic Substrates
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-01-04 , DOI: 10.1002/adom.201701244
Chamika Hippola _{1,

2} , Rajiv Kaudal _{1,

2} , Eeshita Manna ₃ , Teng Xiao _{1,

2} , Akshit Peer _{1,

3,

4} , Rana Biswas _{1,

2,

3,

4} , Warren Dennis Slafer ₅ , Tom Trovato ₆ , Joseph Shinar _{1,

2} , Ruth Shinar _{3,

4}

Affiliation

A key scientific and technological challenge in organic light‐emitting diodes (OLEDs) is enhancing the light outcoupling factor η_out, which is typically <20%. This paper reports experimental and modeling results of a promising approach to strongly increase η_out by fabricating OLEDs on novel flexible nanopatterned substrates that result in a >2× enhancement in green phosphorescent OLEDs (PhOLEDs) fabricated on corrugated polycarbonate (PC). The external quantum efficiency (EQE) reaches 50% (meaning η_out ≥50%); it increases 2.6x relative to a glass/ITO device and 2× relative to devices on glass/poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) or flat PC/PEDOT:PSS. A significant enhancement is also observed for blue PhOLEDs with EQE 1.7× relative to flat PC. The corrugated PC substrates are fabricated efficiently and cost‐effectively by direct room‐temperature molding. These substrates successfully reduce photon losses due to trapping/waveguiding in the organic+anode layers and possibly substrate, and losses to plasmons at the metal cathode. Focused ion beam gauged the conformality of the OLEDs. Dome‐shaped convex nanopatterns with height of ∼280–400 nm and pitch ∼750–800 nm were found to be optimal. Substrate design and layer thickness simulations, reported first for patterned devices, agree with the experimental results that present a promising method to mitigate photon loss paths in OLEDs.

中文翻译：

从图案化塑料基板上制造的OLED增强光提取

在有机发光二极管（OLED）的一个关键的科学和技术挑战是提高光输出耦合系数η_出，其通常<20％。本文报道有前途的方法的实验和模拟结果强烈增加η_出通过在新颖的柔性纳米图案衬底上制造的OLED的是结果在> 2×增强在绿色磷光OLED（PHOLED中）上的波纹聚碳酸酯（PC）制成。外部量子效率（EQE）达到50％（意思是η_出≥50％）; 相对于玻璃/ ITO设备，它增加了2.6倍，而相对于玻璃/聚（3,4-乙烯二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）或平板PC / PEDOT：PSS上的设备，它增加了2倍。与平板PC相比，具有EQE 1.7倍的蓝色PhOLED还可观察到显着增强。瓦楞纸基板可以通过直接室温模制来高效，经济地制造。这些基板成功地减少了由于有机+阳极层（可能还有基板）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的损失。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。基板设计和层厚度模拟，首先报道了有图案的器件，

更新日期：2018-01-04

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