The Study On White Organic Light-emitting Diodes Using New Blue Fluorescent Material MQAB And Red Phosphorescent Material

White Organic light-emitting devices (White Organic Light-emitting Diodes, WOLEDs) have the advantages of low driving voltage, high efficiency, low power consumption and flexibility, there are lots of in-depth research and rapid development, applied to solid-state lighting and as a LCD back Light, and it is considered to be the next generation of green Light source with high efficiency, energy saving and environmental protection. The study mainly includes three parts as follows:Firstly, the part discusses the influence of doping concentration of blue fluorescent material, and light intensity of the spectra obtained at550nm to600nm increases, but it doesn’t belong to the MQAB, After verification, we conclude that it is the complex produced between MQAB and NPB, and we prepare hybrid fluorescence and phosphorescence White Organic light-emitting device based on the complex, it has stable color coordinates and is closer to (0.33,0.33), the luminance and luminous efficiency are enhanced greatly, the research has solved the use of two kinds of luminous materials and can obtain wider spectrum than based on three colors of white light devices, at the same time, the preparation of device structure is simple and easy, greatly reducing the preparation costIn this work, novel and hybrid white organic light-emitting diodes (HWOLEDs) based on blue-green fluorescent MQAB and red phosphorescent Ir(MDQ)2acac materials are fabricated.1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)-benzene (TPBI),1,3-bis(triphenylsilyl)benzene (UGH3) or a mixture of the two at different ratios is used as a spacer layer. It is discovered that the mixed spacer of TPBI and UGH3is able to tune the hole injection/transport effectively. The optimized HWOLEDs of a spacer at a ratio of TPBI:UGH3=1:1exhibits a luminance of14700cd/m2and a current efficiency of11.60cd/A with an excellent color stability. In comparison with the device using spacer of pure TPBI or pure UGH3layer, the current efficiency from the device using mixed spacer enhances200-300%.This part discusses the preparation of some devices based on total phosphor dual-band organic electroluminescent devices, and light-emitting mechanism of each device is also discussed, we can control the energy transfer between various materials by controlling the doping concentration to control the color, the structure for two kinds of luminous materials are mixed in a single layer, and we can obtain the stable color coordinate of pure white light. We can manage the excitons by controlling the energy transfer between different materials and obtain the stable pure white light, at the same time solve the problem that the excitons are difficult to control in phosphorescent devices.