Choi Junhee, Shim Yong Sub, Park Cheol Hwee, Hwang Ha, Kwack Jin Ho, Lee Dong Jun, Park Young Wook, Ju Byeong-Kwon
Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul, 136-713, Republic of Korea.
Samsung Display Co., Samsung St. 181, Tangjeong-Myeon, Asan-City, Chungcheongnam-do, 31454, Republic of Korea.
Small. 2018 Feb;14(7). doi: 10.1002/smll.201702567. Epub 2017 Dec 28.
Fabrication of junction-free Ag fiber electrodes for flexible organic light-emitting diodes (OLEDs) is demonstrated. The junction-free Ag fiber electrodes are fabricated by electrospun polymer fibers used as an etch mask and wet etching of Ag thin film. This process facilitates surface roughness control, which is important in transparent electrodes based on metal wires to prevent electrical instability of the OLEDs. The transmittance and resistance of Ag fiber electrodes can be independently adjusted by controlling spinning time and Ag deposition thickness. The Ag fiber electrode shows a transmittance of 91.8% (at 550 nm) at a sheet resistance of 22.3 Ω □ , leading to the highest OLED efficiency. In addition, Ag fiber electrodes exhibit excellent mechanical durability, as shown by measuring the change in resistance under repeatable mechanical bending and various bending radii. The OLEDs with Ag fiber electrodes on a flexible substrate are successfully fabricated, and the OLEDs show an enhancement of EQE (≈19%) compared to commercial indium tin oxide electrodes.
展示了用于柔性有机发光二极管（OLED）的无结银纤维电极的制备。无结银纤维电极是通过将电纺聚合物纤维用作蚀刻掩膜并对银薄膜进行湿法蚀刻来制备的。该工艺有助于控制表面粗糙度，这对于基于金属线的透明电极很重要，可防止OLED的电不稳定。通过控制纺丝时间和银沉积厚度，可以独立调节银纤维电极的透光率和电阻。银纤维电极在薄层电阻为22.3Ω□时，在550nm处的透光率为91.8%，从而实现了最高的OLED效率。此外，通过测量在可重复机械弯曲和各种弯曲半径下的电阻变化表明，银纤维电极具有出色的机械耐久性。成功制备了在柔性基板上带有银纤维电极的OLED，与商用氧化铟锡电极相比，这些OLED的外量子效率提高了约19%。
