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Efficient polymer electrophosphoreseent devices with interfacial layers

机译:具有界面层的高效聚合物电致磷光器件

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It is shown that several polymers can form insoluble interfacial layers on a poly (ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) layer after annealing of the double-layer structure. The thickness of the interlayer is dependent on the characteristics of the underlying PEDOT.PSS and the molecular weight of the polymers. It is further shown that the electronic structures of the interlayer polymers have a significant effect on the properties of red-light-emitting polymer-based electrophosphorescent devices. Upon increasing the highest occupied molecular orbital and lowest unoccupied molecular orbital positions, a significant increase in current density and device efficiency is observed. This is attributed to efficient blocking of electrons in combination with direct injection of holes from the interlayer to the phosphorescent dye. Upon proper choice of the interlayer polymer, efficient red, polymer-based electrophosphorescent devices with a peak luminance efficiency of 5.5 cd A(-1) (external quantum efficiency = 6 %) and a maximum power-conversion efficiency of 5 Im W-1 can be realized.
机译:已表明,在双层结构退火之后,几种聚合物可以在聚(乙撑二氧噻吩):聚(苯乙烯磺酸盐)(PEDOT:PSS)层上形成不溶性界面层。中间层的厚度取决于下面的PEDOT.PSS的特性和聚合物的分子量。进一步显示,中间层聚合物的电子结构对基于红色发光聚合物的电致磷光器件的性能具有显着影响。在增加最高占据分子轨道和最低未占据分子轨道的位置时,观察到电流密度和器件效率的显着增加。这归因于与从中间层到磷光染料直接注入空穴相结合的电子的有效阻挡。适当选择夹层聚合物后,有效的红色聚合物基电致磷光器件的峰值亮度效率为5.5 cd A(-1)(外部量子效率= 6%),最大功率转换效率为5 Im W-1可以实现。

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