Tailor-made nanostructures bridging chaos and order for highly efficient white organic light-emitting diodes
Tailor-made nanostructures bridging chaos and order for highly efficient white organic light-emitting diodes
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DOI：
10.1038/s41467-019-11032-z
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发表时间：
2019-07-05
影响因子：
16.6
通讯作者：
Reineke, Sebastian
中科院分区：
文献类型：
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作者：
Li, Yungui;Kovacic, Milan;Reineke, Sebastian
有机发光二极管（OLED）遭受臭名昭著的光捕获，导致仅中等的外部量子效率。在这里，我们报告了一种简便的，可扩展的，光刻免费的方法来产生可控的纳米结构的方向随机性和尺寸秩序，显着提高白色OLED的效率。通过反应离子刻蚀，聚二甲基硅氧烷表面在压缩应力释放的作用下产生机械变形，刻蚀的周期性和深度分布从几十纳米到微米不等。我们证明了独立调整的平均深度和主导周期的可能性。将这些纳米结构集成到两单元串联的白色有机发光二极管中，在提取衬底模式下实现了76.3%的最大外量子效率和95.7 lm W-1的发光效率。在10，000 cd·m ~（-2）处获得了1.53 +/- 0.12的增强因子。通过考虑偶极取向、发射波长和偶极在正弦纳米织构上的位置，建立了光学模型。
Organic light-emitting diodes (OLEDs) suffer from notorious light trapping, resulting in only moderate external quantum efficiencies. Here, we report a facile, scalable, lithography-free method to generate controllable nanostructures with directional randomness and dimensional order, significantly boosting the efficiency of white OLEDs. Mechanical deformations form on the surface of poly(dimethylsiloxane) in response to compressive stress release, initialized by reactive ions etching with periodicity and depth distribution ranging from dozens of nanometers to micrometers. We demonstrate the possibility of independently tuning the average depth and the dominant periodicity. Integrating these nanostructures into a two-unit tandem white organic light-emitting diode, a maximum external quantum efficiency of 76.3% and a luminous efficacy of 95.7 lm W-1 are achieved with extracted substrate modes. The enhancement factor of 1.53 +/- 0.12 at 10,000 cd m(-2) is obtained. An optical model is built by considering the dipole orientation, emitting wavelength, and the dipole position on the sinusoidal nanotexture.