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Carbazole based polymers are materials of considerable scientific and industrial interest due to their attractive features, such as hole-transporting, high charge-carrier mobility, and electroluminescent properties. Among carbazole polymers, a central place is reserved for poly (N-vinyl carbazole) (PVK) because it is easily synthesized, is soluble in common organic solvents and as the poly (N-vinyl carbazole)/2,4,7-trinitro-9- fluorenone (PVK/TNF) charge transfer complex is one of the bestknown organic photos conducting materials for application in electrophotography. it’s an electroluminescent material and emits strong fluorescence and long phosphorescence when excited with UV light. In the present research a spectrophotometric method applied for the study of (colored charge transfer complexes) CTC of PVK with TNF reveals the formation of 1:1 (A:D) complex, and formation of CTC with PVK and TNF, From the conductivity of the CT Complex, it is obtained that the concentration of the donor is affected when it reacts with the acceptor and that when we increase the concentration of the donor.