Effect of UV irradiation (λPeak = 365 nm) on the electrical performance of the OFETs with CuPc as active layer is demonstrated. The devices have shown stable electrical performance under dark with avg. and max. field effect mobility of ( 1.0 ± 0.3 ) × 10 -2 and 1.4 × 10-2 cm2, V-1, s-1 respectively. Under UV illumination there found a shift in threshold voltage and change in ON current along with fast response and recovery time of 0.4 s and 2 s respectively with periodic UV ON-OFF pulses. © 2019 IEEE.