TY  - JOUR
A1  - Yang, Xiao Hui
A1  - Jaiser, Frank
A1  - Stiller, Burkhard
A1  - Neher, Dieter
A1  - Galbrecht, Frank
A1  - Scherf, Ullrich
T1  - Efficient polymer electrophosphoreseent devices with interfacial layers
T2  - Advanced functional materials
N2  - 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.
Y1  - 2006
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/46885
SN  - 1616-301X
SN  - 1616-3028
VL  - 16
IS  - 16
SP  - 2156
EP  - 2162
PB  - Wiley-VCH
CY  - Weinheim
ER  -