Two novel p-phenylenediamine-substituted fluorenes have been designed and synthesized. Their applications as hole injection materials in organic electroluminescent devices were investigated. These materials show a high glass transition temperature and a good hole-transporting ability. It has been demonstrated that the 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) doped p-phenylene-diamine-substituted fluorenes, in which F4-TCNQ acts as p-type dopant, are highly conducting with a good hole-transporting property. The organic light emitting devices (OLEDs) utilizing these F4-TCNQ-doped materials as a hole injection layer were fabricated and investigated. The pure Alq 3 -based OLED device shows a current efficiency of 5.2cd/A at the current density of 20mA/cm 2 and the operation lifetime is 1500h with driving voltage increasing only about 0.7mV/h. The device performance and stability of this hole injection material meet the benchmarks for the commercial requirements for OLED materials.