Research On Graphene/Metal Composite Electrode For OLED

With the rapid development of modern mobile communication technology,broadband Internet technology and wireless Internet technology,the world has entered a new"information age",and the information content is increasingly rich and colorful.As an important part of the information industry,display technology has always played a very important role in the development of information technology.With the rapid development of display technology,organic light emitting device?OLED?have become the mainstream of display technology with greater viewing angle,higher color saturation,faster response speed and more energy saving.As demand for display products increases,OLED displays are evolving in a foldable,bendable direction.Therefore,indium tin oxide,which is the most widely used anode material for OLED,is gradually being replaced by other anode materials with excellent mechanical properties due to its fragility and scarcity.At present,the material selection of flexible transparent conductive electrodes widely used in place of ITO mainly includes:metal nanowires,graphene,carbon nanotubes and conductive polymers.Among them,graphene has become one of the most concerned materials in recent years due to its excellent mechanical properties,light transmittance and electrical conductivity.However,due to the process of preparation and transfer of graphene,the conductivity of graphene is greatly reduced,and its work function is low,which makes the hole injection ability of OLED preparation poor,which becomes a big problem of graphene in OLED application.In this paper,the chemical modification method is used to immerse graphene in a gold chloride solution?AuCl₃?with nitromethane as a solvent for chemical doping treatment.Adjusting the processing time and solution concentration,analysis of the doping principle of modified graphene,comparing the photoelectric properties of chemically modified graphene obtained under different parameters,and preparing green phosphorescent OLED.The test results show that after treatment of single-layer graphene,the sheet resistance can be reduced from 365?/sq to 190?/sq,while the optical transmittance decreased by less than 2%.Therefore,the chemical doping method can effectively reduce the surface resistance of graphene and increase the carrier concentration of graphene without significantly affecting the optical transmittance of graphene.For organic light-emitting devices,OLED prepared based on doped single-layer graphene transparent conductive electrodes exhibit much higher performance than a anode made of pure graphene as an anode.The maximum luminance of the OLED with doped graphene anode was increased by 135%and the maximum current efficiency was increased by 25.2%.