Author/Authors :
Duan، نويسنده , , Lian and Chin، نويسنده , , Byung Doo and Yang، نويسنده , , Nam Choul and Kim، نويسنده , , Mu-Hyun and Kim، نويسنده , , Hye Dong and Lee، نويسنده , , Seong Taek and Chung، نويسنده , , Ho Kyoon and Kim، نويسنده ,
Abstract :
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% at a luminance of 9500 cd/m2 at 5.5 V and an extrapolated lifetime of more than 18,000 h from 100 cd/m2.
Keywords :
Blue-emitting polymer , stability , charge balance , Interlayer , Exciplex
