Preparation Of Transparent Electrode By Graphene Oxide Doped CNTS And Its Application In OLEDs

With the increasing requirement of flexible display devices,touch panels,Solar Cells and portable energy storage devices,such as rising demand for flexible transparent conductive films(TCFs).Traditional light-emitting devices electrically conductive films with indium tin oxide(ITO)films,which usually prepared by magnetron sputtering and needed high vacuum environment.With the declining cost ITO thin films of Indium metal content increased,and less flexible ITO films,rigid-brittle and other factors make it in future flexible display field is strictly limited.Carbon nano tubes(CNTs)own excellent conductivity and flexible properties extremely high intension and mechanical properties(Young' s modulus about 1-2 TP a).Certain amount of carbon nanotubes can form a layer of random transparent conducting carbon nanotube networks,which have low sheet resistance and high optical transparent.While,this conductive network fabricated by the deposition of 1-dimentional fibers and the structure is unstable.The adhesion between CNT networks and substrate is weak.The networks formed by CNTs deposition also has a rough surface and bad wettability,all these above are disadvantageous for application among photoelectronic devices.As an emerging 2-dimension carbon nano material,GO has many excellent characteristics,plain structure itself has a very smooth and flat surface,which can be sued to fill the defects of CNT networks.Due to its large amount of containing oxygen functional groups,the wettability of GO/CNT hybrid transparent conductive film's surface can be greatly enhanced,which is advantageous for the solution-based processing of organic electronics for spraying and printing.In addition,GO hybrid can increases surface work function of original CNT films to make the carrier injection easier.In this article,transparent conducting films(TCFs)were fabricated through spary-coating and rod-coating method which are all likely to fabricate in a large scale production.We researched in different GO concentration doping and different sheet sizes separation doping respectively and also created a model describing the transportation among the carbon material TCFs.At the same time,GO hybrid enhanced the surface flatness,wettability as well as the adhesion of the TCFs,all above these improvement are benefit for applications among photoelectronic devices by solution processes and we all discussed in detail.Green organic light-emitting diode(OLED)devices were fabricated by spin-coating and Vacuum Evaporation with the fabricated GO/CNT hybrid transparent anode.The properties such as optoelectronics,surface flatness and wettability of the anodes were discussed to explain the enhancement of the OLED devices.In addition,TPD:PVK hybrid hole transport layer were used to help improve efficiency of hole injection and transportation.