High T/sub g/ hole transport polymers for the fabrication of bright and efficient organic light-emitting devices with an air-stable cathode

An organic electroluminescent device with a luminous efficiency of 20 Im/W, at 14 cd/m/sup 2/, and an external quantum efficiency of 4.6% has been fabricated using a high T/sub g/ hole transport polymer, a small molecule emission layer, and a LiF/Al cathode. The device quantum efficiency can be increased by tuning the ionization potential of the hole-transport moieties. When tested under pulsed voltage mode, in air at room temperature, and without any encapsulation, the device showed a high peak brightness of 4.4/spl times/10/sup 6/ cd/m/sup 2/ at 100 A/cm/sup 2/ and an efficiency of 4.4 cd/A.