An all‐organic light amplification device was designed using organic electroluminescent diode coupled with photoresponsive organic perylene pigment film as an electron photoinjecting layer. Amplification gain of photon conversion from red to red reached 25‐folds with the assistance of the large photocurrent multiplication in a perylene film. Moreover, optical switching behavior caused by the feedback of output light to the photoresponsive layer was observed. Since the spatial pattern of light was conserved, the present device has the potential to grow into new optoelectronic devices for optical image processing. ©1995 American Institute of Physics.