Optical IPA(Interpattern association) neural network model is implemented using CaS(Eu, Sm) electron trapping materials synthesized by the authors. The intensity of infrared stimulated luminescence from CaS(Eu, Sm) shows a linear relationship with the product of the trapped electrons' density and the infrared reading power. Therefore, these materials are capable of forming the optical interconnection weight matrix, which may have large dynamic range and can be quickly erased and re-writen by optical method.