High-Performance Flexible White OLED Based On AgNWs Composite Electrode With Quasi-periodic Nanostructure

Organic light-emitting diodes(OLEDs)have undergone nearly 30 years of research and development,and their performance has been continuously improved.It is considered as the third-generation flat panel display technology that replaces liquid crystal(LCD)displays.OLED display technology has occupied the dominant position in the current display field by virtue of its wide viewing angle,wide color gamut,self-illumination,fast response,low consumption,light weight and flexibility,and its market share will continue to grow.However,for OLED display technology,How to solve the photon loss in planar OLED devices and improve the out-coupling efficiency become one of the important challenges for the future development of OLED display technology.Flexible OLED display technology,which is one of the branches of OLED display technology,has attracted great attention because of its flexibility.It has very broad application prospects in mobile phones,television,wearable devices and other fields.In the flexible OLED display technology,selecting a flexible electrode that has excellent optical and electrical properties while also owning a low roughness is an important challenge of this technology.In this thesis,we demonstrated a novel silver nanowire composite electrode based on a flexible substrate with quasi-periodic nanostructures,which has high optical transmittance,low square resistance,and excellent mechanical bending properties.We also introduced a zinc oxide modification layer on the silver nanowire electrode,which could solve the problem of high surface roughness of the silver nanowire electrode,and demonstrated quasi-periodic nanostructure on the composite electrode to regulate the light field of the device.The performance of flexible white OLEDs could be significantly improved by replacing traditional ITO electrodes to composite electrodes with quasi-periodic nanostructures.We demonstrated flexible inverted green OLEDs with maximum current efficiency was 102 cd A-1(without quasi-periodic nanostructures).For the flexible white OLEDs with two-sided imprinted,the power efficiency of 110.3 1mW-1 and the external quantum efficiency of 59%were achieved at 1000 cd m-2.The maximum power efficiency and the maximum external quantum efficiency were 126.6 1m W-1 and 61.6%respectively.