Influence of the hole-carrier layer controlled by electrochemical method on electroluminescence

Two-layer light emitting devices were fabricated using electrochemical deposited polybithiophene (PBTh) as the hole-transport layer and spin coated blend of polyoctylthiophene and a butadiene derivative as the emitting layer. It was found that the current density used for depositing polybithiophene greatly affects the effectiveness of the PBTh films as the hole-transport layers in enhancing the electroluminescent (EL) intensity and efficiency. Through analyzing the oxidation-reduction properties and conductivity of the PBTh films and the EL efficiency of the device, it can be concluded that there is an optimal current density for depositing the PBTh hole transport layer for the El devices.

[1]  M. Wrighton,et al.  Solid State Microelectrochemistry: Electrical Characteristics of a Solid State Microelectrochemical Transistor Based on Poly(3-methylthiophene). , 1987 .

[2]  J. Sheats.  Stacked Organic Light-Emitting Diodes in Full Color , 1997, Science.

[3]  Donal D. C. Bradley,et al.  High brightness and efficiency blue light-emitting polymer diodes , 1998 .

[4]  Tadashi Kusumoto,et al.  Novel structure of organic electroluminescence cells with conjugated oligomers , 1993 .

[5]  S. Chen,et al.  Field-effect transistor with the water-soluble self-acid-doped polyaniline thin films as semiconductor , 1998 .

[6]  R. N. Marks,et al.  Light-emitting diodes based on conjugated polymers , 1990, Nature.

[7]  Chihaya Adachi,et al.  Molecular design of hole transport materials for obtaining high durability in organic electroluminescent diodes , 1995 .

[8]  L. Rothberg,et al.  Design and Application of Electron-Transporting Organic Materials , 1995, Science.

[9]  M. Berggren,et al.  Micrometer- and Nanometer-Sized Polymeric Light-Emitting Diodes , 1995, Science.

[10]  R. N. Marks,et al.  Light-emitting diodes based on conjugated polymers , 1990, Nature.

[11]  C. Tang,et al.  Organic Electroluminescent Diodes , 1987 .

[12]  A. J. Lovinger,et al.  Luminescence Enhancement by the Introduction of Disorder into Poly(p-phenylene vinylene) , 1995, Science.

[13]  Tetsuo Tsutsui,et al.  Control of emission characteristics in organic thin‐film electroluminescent diodes using an optical‐microcavity structure , 1993 .

[14]  Katsutoshi Nagai,et al.  Multilayer White Light-Emitting Organic Electroluminescent Device , 1995, Science.

[15]  Donal D. C. Bradley,et al.  Efficient multilayer electroluminescence devices with poly(m-phenylenevinylene-co-2,5-dioctyloxy-p-phenylenevinylene) as the emissive layer , 1997 .

[16]  C. Zheng,et al.  ; 0 ; , 1951 .

[17]  Tetsuo Tsutsui,et al.  Blue light‐emitting organic electroluminescent devices , 1990 .

[18]  Masanori Ozaki,et al.  Organic electroluminescent diodes as a light source for polymeric integrated devices , 2001, SPIE OPTO.

[19]  K. Yoshino,et al.  Color‐variable electroluminescence from multilayer polymer films , 1996 .