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Dual functional anode for organic light-emitting devices by directly imprinted nanostructured ultrathin Au film
Applied Physics Letters ( IF 4 ) Pub Date : 2022-04-25 , DOI: 10.1063/5.0083482
Chi Ma 1, 2 , Huan Lou 1
Affiliation  

The ultrathin metal film with excellent electrical conductivity and high visible-band transmittance has attracted considerable attention as a transparent electrode for the organic light-emitting devices (OLEDs). However, the deficient surface morphology and poor continuity of low thickness evaporated metal films and the surface plasmon-polaritons (SPPs) mode induced energy loss still seriously limit the actual efficiency of OLEDs. In this work, the thermal nanoimprint lithography has been further modified and directly applied to fabricate nanostructures onto the ultrathin Au film. During the imprinting process, the surface smoothness and conductivity of the Au film are obviously optimized with the formation of nanostructures. After integrating proper nanostructures into OLEDs, the photons that trapped by SPPs mode within the device were effectively out-coupled. The current efficiency and luminance have been enhanced 45.3% and 18.1%, respectively. Furthermore, the emitting properties of the OLEDs were also modified by the nanostructures, and the directional transmission capability of output light was significantly improved.

中文翻译:

直接压印纳米结构超薄金膜用于有机发光器件的双功能阳极

具有优异导电性和高可见光波段透射率的超薄金属膜作为有机发光器件(OLED)的透明电极引起了相当大的关注。然而,低厚度蒸发金属膜的表面形貌缺陷和连续性差以及表面等离子体激元 (SPP) 模式引起的能量损失仍然严重限制了 OLED 的实际效率。在这项工作中,热纳米压印光刻技术得到进一步改进,并直接应用于在超薄 Au 薄膜上制造纳米结构。在压印过程中,随着纳米结构的形成,Au 薄膜的表面光滑度和导电性得到明显优化。在将适当的纳米结构集成到 OLED 中后,被器件内的 SPP 模式捕获的光子被有效地耦合出去。电流效率和亮度分别提高了 45.3% 和 18.1%。此外,纳米结构还改变了OLED的发光性能,显着提高了输出光的定向传输能力。
更新日期:2022-04-25
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