Preparation And Application Of The Graphene And Silver Nanowires Hybrid Transparent Electrode For Organic Electroluminescent Devices

Transparent electrode is the crucial part of flat panel display, solar cell, touch panel and so on, because of its high optical transmittance and excellent current transport. It is well known that Indium Tin Oxide(ITO) has been widely used as transparent electrode in photoelectric device for decades, but ITO has several shortcomings as follow: poor flexibility, scarce resources, expensive, easily eroded by acids and alkalis. Now that ITO limits the development of flexible photoelectric device, it is necessary to find a suitable flexible transparent electrode in the long term. Graphene and silver-nanowires hybrid electrode attracts considerable attention due to its high optical transmittance and low sheet resistance. This paper focused on preparation, performance and application of hybrid electrode, and the following work was done:(1)Based on principle of vacuum filtration, the reasonable preparation scheme of hybrid film was formulate. Then flexible and uniform hybrid films were prepared.(2)Several performances of hybrid films were research, including sheet resistance, optical transmittance, work function, surface roughness and flexibility. From the point of application, experimental results, demand range sand influencing factors of these parameters were analyzed. As the results, while silver-nanowires density was 0.4~0.8mg/L, hybrid electrodes which could meet demands of OLEDs had low sheet resistance, high transmittance, high work function, low roughness and flexibility.(3)The model for carrier transport in hybrid electrode was studied. Then the features of carrier transport in hybrid electrode with different silver-nanowires density were analyzed. Finally, this model was verified by analyzing the variation of carrier concentration and mobility in hybrid electrode. The results showed as following: with increment of silver-nanowires density, carrier concentration decreased first and then increased, carrier mobility decreased.(4)Organic electroluminescent devices with graphene and silver-nanowires hybrid electrode were prepared. Several performances of organic electroluminescent devices were research, including luminescent spectrum, voltage-current density characteristic curve, voltage-luminance characteristic curve and voltage-current efficiency characteristic curve. The results showed as following: performances of OLEDs with hybrid electrode were better than that of OLEDs with pure graphene electrode; OLEDs exhibited optimum performance, while silver-nanowires density was 0.8mg/L.