材料科学
有机发光二极管
电极
光电子学
薄板电阻
透射率
制作
二极管
发光二极管
量子效率
纳米技术
图层(电子)
医学
化学
替代医学
物理化学
病理
作者
Mina Riahi,Kou Yoshida,Hassan Hafeez,Ifor D. W. Samuel
标识
DOI:10.1002/aelm.202300675
摘要
Abstract Some applications of organic light‐emitting diodes (OLEDs) require large area, high light output, and high uniformity. It is difficult to achieve these attributes simultaneously because of voltage drops in the contacts, which cannot easily satisfy high optical transparency and electrical conductivity simultaneously. In large area OLEDs, thin electrodes with high sheet resistance induce voltage drops across the devices, leading to non‐uniform distribution of light. However, thick electrodes with low sheet resistance decrease the light output due to low transmittance. To overcome this trade‐off, a multilayer hybrid electrode based on Ag (20 nm)/WO 3 /Ag (20 nm)/WO 3 is designed to obtain high electrical conductance with low optical loss. Compared to conventional devices using a single Ag (40 nm) top electrode, there is a considerable increase in the external quantum efficiency (EQE) of the device using this electrode (from 11.5% to 25.5% at 1000 cd m −2 ), while maintaining similar sheet resistance. In addition, a large area (≈57 cm 2 ) OLED with the hybrid electrode demonstrates a luminance uniformity of 77% as compared to a device using single silver electrode with uniformity of 66%. Therefore, the proposed Ag/WO 3 /Ag/WO 3 hybrid electrode is a promising choice for the fabrication of efficient and uniform large‐area OLEDs.
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