A New Kind of Buffer Layer of TiO₂ Self-Assembled Material in Organic Electroluminescent Devices

A new kind of TiO₂ self-assembled nanometer material has been fabricated and is used as a hole-injecting buffer layer in organic electroluminescent devices. The luminance and the efficiency of a device individually rises from 1500 cd/m² to 5000 cd/m² and from 2.0 cd/A to 3.92 cd/A at the current density of 100 mA/cm². 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.