Research On The Plasmon Resonance Effect In Organic Light-emitting Devices Based On Silver Nanowires

With the rapid development of information technology,flexible electroluminescent devices not only have the advantages of high brightness,fast response,low power consumption and low cost,but also have the advantages of flexibility,light weight and durability.Many problems in the large-scale preparation and application of flexible OLED,such as its mechanical flexibility,surface smoothness and service life,are closely related to the performance of flexible transparent electrodes.Silver nanowires are considered as the most promising flexible electrode materials due to their excellent photoelectric properties and mechanical properties.In this paper,silver nanowire was prepared by polyol method,then silver nanowire electrode was prepared by spin coating and brush coating,and finally organic electroluminescent device based on silver nanowire electrode was prepared.On this basis,we built a simulation model to study the plasma resonance effect in OLED based on silver nanowires.The specific work contents are as follows:Firstly,silver nanowires?Ag NW?were rapidly prepared by the method of polyols.Different reaction conditions were explored,including molecular weight of reactant PVP,molar ratio between PVP and silver nitrate,solution concentration of Cu Cl₂·H₂O,reaction temperature and reaction time,and total volume of reaction solution.Finally,silver nanowires with an average diameter of 30 nm were successfully synthesized.Then the silver nanowire electrode was prepared by different processes using the silver nanowire synthesized by us.The influence of the experimental conditions of spin coating and brush coating on the square resistance and transmittance of silver nanowire electrode was explored.Organic electroluminescent devices were prepared by using silver nanowire electrode based on spin coating.Finally,FDTD Solutions software was selected to establish OLED simulation model based on silver nanowire electrode,and silver nanoparticles were introduced to form silver nanowire/silver nanoparticle composite structure to study the resonant coupling effect of plasma.Firstly,an optical model of silver nanowires/silver nanoparticles composite structure was established.The effects of the distance between silver nanowires and silver nanoparticles,the size of silver nanoparticles and the refractive index of the surrounding medium on the resonance characteristics of the composite structure were discussed.Then a simulation model of OLED was established based on the parallel arrays of silver nanowire electrodes.On the one hand,the optical output layer is introduced on the outside of the silver nanowire electrode to improve the optical extraction efficiency of the device.On the other hand,the luminescence intensity of the dipole was improved by introducing the silver nanowire/silver nanoparticle composite structure,and the influence of the distance between the silver nanowire/silver nanoparticle,the shape and size of the silver nanoparticle on the optical output intensity of the device was studied.The results show that the surface electric field of the composite structure can be enhanced by using the resonant coupling between silver nanowires and nanoparticles,the luminescence intensity of nearby dipoles can be effectively enhanced,and the overall optical output performance of the device can be improved.In this paper,silver nanowires with a diameter of 30 nm were first synthesized by polyol method,and then silver nanowires with high performance were prepared by spin coating method and brush coating method.On this basis,organic electroluminescent devices were prepared.Next,the plasmon resonance effect of the silver nanowire/silver nanoparticle composite structure was simulated.By introducing a dielectric layer with high refractive index on the outside of the composite electrode,the optical output of the device was improved and the radiation intensity of excitons was enhanced.