Multilayer blue polymer light-emitting devices with spin-coated interlayers

摘要

Employment of multilayer heterostructures is a common approach to achieve efficiency and stable organic light emitting diodes (OLEDs). In this work, we report multilayer blue polymer light-emitting devices (PLEDs) by using spin-coated fluorene-triarylamine copolymers as interlayers between the conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT) and the emitting layer. A blue PLED with stepped hole injection profile yields an external quantum efficiency of 6.0 percent at a luminance of 9500 cd/m~2 at 5.5 V and an extrapolated lifetime of more than 18,000h from 100 cd/m~2.