Study On Red OLED For Optical Communication Of Local-area Network

Organic light-emitting devices (OLED) have good prospect for development asthe next generation display technology mainly due to an organic electroluminescentdevice (OLED) at low power consumption, environment-friendly, flexible andadjustable spectrum.OLEDs have a high potential to meet human requirements as bea good source for solid-state lighting and LCD display backlight.Therefore, inrecent years there are a lot of people committed to the development ofhigh-efficiency, high brightness organic light-emitting devices.(OLED) has beendeveloped for realized commercialization in small-area flat panel displays and isnow stepping towards solid-state lighting. OLED is able to act as anelectrical/optical conversion device for application in the field of opticalcommunication due to its high response speed. In particular, red OLEDs (R-OLEDs)of the suitable wavelength can be integrated with organic light detector (OPD) onpolymer optical fiber (POF) to assemble organic fiber-optic communication LANsystem because OLEDs can be deposited on various substrates under room ambient.Therefore open new areas-telecommunication. Communication has penetrated intoall walks of life, each of us lives. High-speed, short-range, low power consumptionis a strong pursuit of the current user communication technology, based on polymerfoptical fiber (POF) short-distance distribution networks will be widely used inautomotive, airborne communications, military communications, LAN, FTTH (FiberTo the Home) and other areas. currently the backbone transmission network is to relyon fiber optic communication is completed, a short distance from the technicalrequirements is much lower than long-distance optical fiber communicationbackbone fiber-optic communications technology, long-distance fiber-optic communications technology for short-range communication will cause a waste ofresources, high cost, technical complexity and difficult to spread, therefore,developed a low-cost, reliable, compact, easy to install short-range interconnectdevices (such as optical transmitters, receivers, connected, couplers, etc.) will be themassive popularity of short-fiber-optic communications. As an electrical/opticalconversion device, high emission efficiency would be of great importance. In thispaper, we fabricated a set of R-OLEDs based on Ir(piq)2acac with different devicestructures. We use the hole transporting layer and electron transporting layer as hostof light emitting layer respectively to improve the efficiency of OLED. And learningfrom the hybrid host device structure to improve device efficiency, we introduce anintermixed layer in the middle of double-emitting layer for further expansion ofexciton recombination zone. The device efficiency is increased by utilizingintermixed host structure, which improves30%(dopant as Ir(MDQ)2aac) and66%(dopant as Ir(piq)2aac) as compared to the reference device. Device with thestructure of new material would achieve a quite high efficiency as optical source.Output optical power for communications is over5mW/cm2. In this experiment, thematerial in the experiment is common low cost materials. The structure in our designcould obtain rather high efficiency combined with new material to get higher outputpower signal source and it’s promising. The intermixed structure with less materialhelps to reduce development and production cost with good characteristics, and it’seasy to modulate.