Copper Nanowires And Graphene-like MoS₂ Composite Transparent Electrode And Its Application In OLED Devices

Organic light-emitting diodes?OLED?have many outstanding properties such as light weight,wide viewing angle,low driving voltage?3-12V?,low power consumption,flexibility,high color purity and so on,and it is favored by researchers at home and abroad.The anode material of the traditional OLED generally uses indium tin oxide?ITO?,However,ITO has the disadvantages of complicated preparation process,fragility,high cost,and inflexibility,which does not meet the requirements of modern people for wearable devices.Copper nanowires?CuNWs?/Molybdenum disulfide?MoS₂?composite transparent electrode can well meet people's needs.This paper introduces the preparation of CuNWs by hydrothermal synthesis and also describes the preparation of few layers of MoS₂ by liquid phase ultrasonic method.In order to prevent the rapid oxidation of CuNWs,MoS₂ nanosheet solution was spin-coated on the CuNWs transparent conductive film,and we also spin-coated poly?3,4-ethylenedioxythiophene?-polystyrenesulfonic acid?PEDOT:PSS?solution to further improve the work function of the composite transparent film.Finally,CuNWs composite transparent anode with high transmittance and low square resistance are successfully prepared,and high performance OLED devices are prepared by vacuum coating technology.The main contents are as follows:Firstly,we use octadecylamine(C₁₈H₃₉N,ODA),copper chloride dihydrate?CuCl₂?2H₂O?and ascorbic acid?C₆H₈O₆?to prepare CuNWs,and we systematically studied the effect of different conditions on the growth of CuNWs.Scanning electron microscope?SEM?,atomic force microscope?AFM?and optical microscope?OM?and other equipment are also used to characterize the morphology of CuNWs.The average length of the finally grown CuNWs is greater than 110?m and the average diameter is about 40nm.Secondly,preparation of graphene-like MoS₂ nanosheets,we mixed the bulk material MoS₂ and N-methylpyrrolidone?C₅H₉NO,NMP?solvent at a certain molar ratio,and obtained graphene-like MoS₂ nanosheets by ultrasonic peeling.The effects of ultrasonic power,ultrasonic time,molar ratio of MoS₂ powder and NMP on MoS₂stripping efficiency and morphology were systematically studied.The conlusion as follows:the exfoliated graphene-like MoS₂ has the highest efficiency that the lateral size is about 11?m and the number of layers is about four when the condition is like this:the NMP is 25ml,MoS₂ powder is 1g,ultrasonic time is 12h,ultrasonic power is 360w,and ultrasonic temperature is about 6?.Thirdly,preparation of CuNWs/graphene-like MoS₂ composite transparent conductive film.We use vacuum suction filtration and tabletting to deposit CuNWs evenly on PET.The CuNWs transparent conductive film prepared by this method has good performance?when the square resistance is 31.93?/sq,the average transmittance is 90.794%?.We spin-coated a layer of graphene-like MoS₂ nanosheet solution on the CuNWs conductive grid to isolate oxygen,reduce the roughness of the CuNWs surface and improve the conductivity of the film.Fourthly,preparation of flexible green OLED device.In order to further improve the work function of the CuNWs/MoS₂ composite film,a layer of PEDOT:PSS solution was spin-coated on the surface of the composite film,and We finally prepared a composite transparent anode like this:CuNWs/MoS₂/PEDOT:PSS.Moreover,the flexible green OLED device is prepared.Compared with the OLED device with CuNWs/PEDOT:PSS as the anode,the current density of the device is increased by about 446%,and the maximum brightness is increased by nearly 133%.