Abstract
The performance of blue polymer light-emitting diodes (PLEDs) based onpoly(9,9-dioctylfluorene) (PFO) is improved by introducing a thin layerof sodium hydroxide (NaOH) between the calcium cathode and the PFOemissive layer. By replacing the commonly used Ca/Al cathode by a NaOH(2.5 nm)/Ca (10 nm)/Al cathode, the driving voltage is reduced from8.3 V to 5.4 V and the light-emitting efficiency is enhanced from0.46 cd/A to 0.72 cd/A for achieving a luminance of 500 cd/m2,respectively. Moreover, the device with NaOH/Ca/Al cathode shows a pureblue emission of (0.17, 0.12) at high brightnesses. These improvementsare attributed to introduction of a thin layer of NaOH that can lowerthe interfacial barrier and facilitate electron injection.
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