The present invention discloses an triphenylene-based fused carbazole compound is represented by the following formula (1) or formula (2), the organic EL device employing the derivative as light emitting host of emitting layer can display good performance like as lower driving voltage and power consumption, increasing efficiency and half-life time. wherein Ar, X1 to X4, m, and R1 to R3 are the same definition as described in the present invention.