An alkylsilylphenoxy PPV chromophore

Abstract

The synthesis and characterization of a poly(p-phenylene vinylene) (PPV) based chromophore containing a long chain alkylsilylphenoxy side group have been reported. Physical and electroluminescent (EL) properties of the green light emitting polymer, poly [2-4'-dimethyldodecylsilylphenyloxy-1,4-phenylene vinylene] (SiPhOPPV), in single and multilayer configurations have been investigated. The maximum brightness and efficiency were found to be 2600 cd/m(2) at 23 V and 0.24 lm/W at 12 V for double layer device configuration in which PEDOT (25 nm) was used a hole transport layer. The use the SiPhOPPVas one of the components in a chromophore blend system was also investigated and the results compared to those for other related blends. When SiPhOPPV is used in a double layer blend configuration, EL intensity as well as device efficiency increased by a factor of 5. The composition of blend systems, the ratio of hole and electron transport components and the degree of phase separation between different chromophores are found to be important parameters for the device efficiency and balanced charge injection. (C) 2002 Elsevier Science B.V. All rights reserved.