Enhanced brightness and efficiency in organic electroluminescent devices using SiO2 buffer layers

Organic electroluminescent devices using SiO2 as a hole-injecting buffer have been fabricated. With the presence of the buffer, the luminance of the device reaches 1820 cd/m2 at the current density of 20 mA/cm2, which corresponds to an efficiency of 9.1 cd/A. The enhancements in brightness and efficiency are attributed to an improved balance of hole and electron injections due to blocking of the injected holes by the buffer layer and a more homogeneous adhesion of the hole transporting layer to the anode.

[1]  Toshio Matsumoto,et al.  Bright organic electroluminescent devices having a metal-doped electron-injecting layer , 1998 .

[2]  Junji Kido,et al.  Fabrication of highly efficient organic electroluminescent devices , 1998 .

[3]  N. Peyghambarian,et al.  Aluminum based cathode structure for enhanced electron injection in electroluminescent organic devices , 1998 .

[4]  S. Shaheen,et al.  Highly efficient and bright organic electroluminescent devices with an aluminum cathode , 1997 .

[5]  Joseph Shinar,et al.  Fabrication and electroluminescence of double-layered organic light-emitting diodes with the Al2O3/Al cathode , 1997 .

[6]  C. Tang,et al.  Enhanced electron injection in organic electroluminescence devices using an Al/LiF electrode , 1997 .

[7]  Ching Wan Tang,et al.  Organic electroluminescent devices with improved stability , 1996 .

[8]  Hiroshi Inada,et al.  Multilayered organic electroluminescent device using a novel starburst molecule, 4,4’,4‘‐tris(3‐methylphenylphenylamino)triphenylamine, as a hole transport material , 1994 .

[9]  I. Parker,et al.  Fabrication of polymer light‐emitting diodes using doped silicon electrodes , 1994 .

[10]  A. J. Heeger,et al.  Polyaniline as a transparent electrode for polymer light‐emitting diodes: Lower operating voltage and higher efficiency , 1994 .

[11]  Ian D. Parker,et al.  Carrier tunneling and device characteristics in polymer light‐emitting diodes , 1994 .

[12]  Hiroshi Tokailin,et al.  Transient behavior of organic thin film electroluminescence , 1992 .

[13]  Tetsuo Tsutsui,et al.  Confinement of charge carriers and molecular excitons within 5‐nm‐thick emitter layer in organic electroluminescent devices with a double heterostructure , 1990 .

[14]  C. H. Chen,et al.  Electroluminescence of doped organic thin films , 1989 .

[15]  Tetsuo Tsutsui,et al.  Organic Electroluminescent Device with a Three-Layer Structure , 1988 .

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